style: Detabify the C code... again.

Leftovers from 9824c08 and
1604cfb (see #18446). These don't
seem to be regressions, but never happened. Perhaps they were lost
in the merge.

regen_perly.pl was, again, left alone as it requires rebuilding perly.*
which is beyond a simple indentation change.

XSUB.h

@@ -160,34 +160,34 @@ is a lexical C<$_> in scope.
 #define dAX const I32 ax = (I32)(MARK - PL_stack_base + 1)
 
 #define dAXMARK				\
-	I32 ax = POPMARK;	\
-	SV **mark = PL_stack_base + ax++
+        I32 ax = POPMARK;	\
+        SV **mark = PL_stack_base + ax++
 
 #define dITEMS I32 items = (I32)(SP - MARK)
 
 #define dXSARGS \
-	dSP; dAXMARK; dITEMS
+        dSP; dAXMARK; dITEMS
 /* These 3 macros are replacements for dXSARGS macro only in bootstrap.
    They factor out common code in every BOOT XSUB. Computation of vars mark
    and items will optimize away in most BOOT functions. Var ax can never be
    optimized away since BOOT must return &PL_sv_yes by default from xsubpp.
    Note these macros are not drop in replacements for dXSARGS since they set
    PL_xsubfilename. */
 #define dXSBOOTARGSXSAPIVERCHK  \
-	I32 ax = XS_BOTHVERSION_SETXSUBFN_POPMARK_BOOTCHECK;	\
-	SV **mark = PL_stack_base + ax - 1; dSP; dITEMS
+        I32 ax = XS_BOTHVERSION_SETXSUBFN_POPMARK_BOOTCHECK;	\
+        SV **mark = PL_stack_base + ax - 1; dSP; dITEMS
 #define dXSBOOTARGSAPIVERCHK  \
-	I32 ax = XS_APIVERSION_SETXSUBFN_POPMARK_BOOTCHECK;	\
-	SV **mark = PL_stack_base + ax - 1; dSP; dITEMS
+        I32 ax = XS_APIVERSION_SETXSUBFN_POPMARK_BOOTCHECK;	\
+        SV **mark = PL_stack_base + ax - 1; dSP; dITEMS
 /* dXSBOOTARGSNOVERCHK has no API in xsubpp to choose it so do
 #undef dXSBOOTARGSXSAPIVERCHK
 #define dXSBOOTARGSXSAPIVERCHK dXSBOOTARGSNOVERCHK */
 #define dXSBOOTARGSNOVERCHK  \
-	I32 ax = XS_SETXSUBFN_POPMARK;  \
-	SV **mark = PL_stack_base + ax - 1; dSP; dITEMS
+        I32 ax = XS_SETXSUBFN_POPMARK;  \
+        SV **mark = PL_stack_base + ax - 1; dSP; dITEMS
 
 #define dXSTARG SV * const targ = ((PL_op->op_private & OPpENTERSUB_HASTARG) \
-			     ? PAD_SV(PL_op->op_targ) : sv_newmortal())
+                             ? PAD_SV(PL_op->op_targ) : sv_newmortal())
 
 /* Should be used before final PUSHi etc. if not in PPCODE section. */
 #define XSprePUSH (sp = PL_stack_base + ax - 1)
@@ -206,7 +206,7 @@ is a lexical C<$_> in scope.
 #define dXSFUNCTION(ret)		XSINTERFACE_CVT(ret,XSFUNCTION)
 #define XSINTERFACE_FUNC(ret,cv,f)     ((XSINTERFACE_CVT_ANON(ret))(f))
 #define XSINTERFACE_FUNC_SET(cv,f)	\
-		CvXSUBANY(cv).any_dxptr = (void (*) (pTHX_ void*))(f)
+                CvXSUBANY(cv).any_dxptr = (void (*) (pTHX_ void*))(f)
 
 #define dUNDERBAR dNOOP
 #define UNDERBAR  find_rundefsv()
@@ -323,10 +323,10 @@ Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
 
 #define XSRETURN(off)					\
     STMT_START {					\
-	const IV tmpXSoff = (off);			\
-	assert(tmpXSoff >= 0);\
-	PL_stack_sp = PL_stack_base + ax + (tmpXSoff - 1);	\
-	return;						\
+        const IV tmpXSoff = (off);			\
+        assert(tmpXSoff >= 0);\
+        PL_stack_sp = PL_stack_base + ax + (tmpXSoff - 1);	\
+        return;						\
     } STMT_END
 
 #define XSRETURN_IV(v) STMT_START { XST_mIV(0,v);  XSRETURN(1); } STMT_END
@@ -409,48 +409,48 @@ Rethrows a previously caught exception.  See L<perlguts/"Exception Handling">.
 */
 
 #define DBM_setFilter(db_type,code)				\
-	STMT_START {						\
-	    if (db_type)					\
-	        RETVAL = sv_mortalcopy(db_type) ;		\
-	    ST(0) = RETVAL ;					\
-	    if (db_type && (code == &PL_sv_undef)) {		\
-	        SvREFCNT_dec_NN(db_type) ;			\
-	        db_type = NULL ;				\
-	    }							\
-	    else if (code) {					\
-	        if (db_type)					\
-	            sv_setsv(db_type, code) ;			\
-	        else						\
-	            db_type = newSVsv(code) ;			\
-	    }	    						\
-	} STMT_END
+        STMT_START {						\
+            if (db_type)					\
+                RETVAL = sv_mortalcopy(db_type) ;		\
+            ST(0) = RETVAL ;					\
+            if (db_type && (code == &PL_sv_undef)) {		\
+                SvREFCNT_dec_NN(db_type) ;			\
+                db_type = NULL ;				\
+            }							\
+            else if (code) {					\
+                if (db_type)					\
+                    sv_setsv(db_type, code) ;			\
+                else						\
+                    db_type = newSVsv(code) ;			\
+            }	    						\
+        } STMT_END
 
 #define DBM_ckFilter(arg,type,name)				\
         STMT_START {						\
-	if (db->type) {						\
-	    if (db->filtering) {				\
-	        croak("recursion detected in %s", name) ;	\
-	    }                     				\
-	    ENTER ;						\
-	    SAVETMPS ;						\
-	    SAVEINT(db->filtering) ;				\
-	    db->filtering = TRUE ;				\
-	    SAVE_DEFSV ;					\
+        if (db->type) {						\
+            if (db->filtering) {				\
+                croak("recursion detected in %s", name) ;	\
+            }                     				\
+            ENTER ;						\
+            SAVETMPS ;						\
+            SAVEINT(db->filtering) ;				\
+            db->filtering = TRUE ;				\
+            SAVE_DEFSV ;					\
             if (name[7] == 's')                                 \
                 arg = newSVsv(arg);                             \
-	    DEFSV_set(arg) ;					\
-	    SvTEMP_off(arg) ;					\
-	    PUSHMARK(SP) ;					\
-	    PUTBACK ;						\
-	    (void) perl_call_sv(db->type, G_DISCARD); 		\
-	    SPAGAIN ;						\
-	    PUTBACK ;						\
-	    FREETMPS ;						\
-	    LEAVE ;						\
+            DEFSV_set(arg) ;					\
+            SvTEMP_off(arg) ;					\
+            PUSHMARK(SP) ;					\
+            PUTBACK ;						\
+            (void) perl_call_sv(db->type, G_DISCARD); 		\
+            SPAGAIN ;						\
+            PUTBACK ;						\
+            FREETMPS ;						\
+            LEAVE ;						\
             if (name[7] == 's'){                                \
                 arg = sv_2mortal(arg);                          \
             }                                                   \
-	} } STMT_END                                                     
+        } } STMT_END                                                     
 
 #if 1		/* for compatibility */
 #  define VTBL_sv		&PL_vtbl_sv