Re-indent the case statement in pp_iter, ready for the next commit.

This commit is purely a whitespace change. I haven't "tidied" up any of the
quirky formatting, just moved it all over by 4 spaces.

pp_hot.c

@@ -3896,6 +3896,7 @@ PP(pp_iter)
     itersvp = CxITERVAR(cx);
     assert(itersvp);
 
+    {
     switch (CxTYPE(cx)) {
 
     case CXt_LOOP_LAZYSV: /* string increment */
@@ -4047,6 +4048,7 @@ PP(pp_iter)
     default:
         DIE(aTHX_ "panic: pp_iter, type=%u", CxTYPE(cx));
     }
+    }
 
     /* Try to bypass pushing &PL_sv_yes and calling pp_and(); instead
      * jump straight to the AND op's op_other */