regcomp.h - get rid of EXTRA_STEP defines

They are unused these days.

Author: demerphq

regcomp.c

@@ -12712,7 +12712,6 @@ S_reginsert(pTHX_ RExC_state_t *pRExC_state, const U8 op,
     PERL_ARGS_ASSERT_REGINSERT;
     PERL_UNUSED_CONTEXT;
     PERL_UNUSED_ARG(depth);
-/* (REGNODE_TYPE((U8)op) == CURLY ? EXTRA_STEP_2ARGS : 0); */
     DEBUG_PARSE_FMT("inst"," - %s", REGNODE_NAME(op));
     assert(!RExC_study_started); /* I believe we should never use reginsert once we have started
                                     studying. If this is wrong then we need to adjust RExC_recurse

regcomp.h

@@ -442,7 +442,6 @@ struct regnode_ssc {
 /* These should no longer be used directly in most cases. Please use
  * the REGNODE_AFTER() macros instead. */
 #define NODE_STEP_REGNODE	1	/* sizeof(regnode)/sizeof(regnode) */
-#define EXTRA_STEP_2ARGS	EXTRA_SIZE(struct regnode_2)
 
 /* Core macros for computing "the regnode after this one". See also
  * Perl_regnode_after() in reginline.h