opt_regexpmatch1 is actually making things slower.

----

trunk: ruby 2.6.0dev (2018-09-18 trunk 64767) [x86_64-darwin15]
ours: ruby 2.6.0dev (2018-09-18 opt_regexpmatch 64775) [x86_64-darwin15]
last_commit=opt_regexpmatch1 is actually making things slower.
Calculating -------------------------------------
                              trunk        ours
Optcarrot Lan_Master.nes     33.877      35.282 fps

Comparison:
             Optcarrot Lan_Master.nes
                    ours:        35.3 fps
                   trunk:        33.9 fps - 1.04x  slower

1 files changed, 0 insertions, 11 deletions

diff --git a/insns.def b/insns.def
index 7fb7a577c8..35a6aa9def 100644
--- a/insns.def
+++ b/insns.def
@@ -1428,17 +1428,6 @@ opt_not
     }
 }
 
-/* optimized regexp match */
-DEFINE_INSN
-opt_regexpmatch1
-(VALUE recv)
-(VALUE obj)
-(VALUE val)
-// attr bool leaf = false; /* rb_reg_prepare_enc() may rb_raise() that calls rb_funcallv() */
-{
-    val = vm_opt_regexpmatch1(recv, obj);
-}
-
 /* optimized regexp match 2 */
 DEFINE_INSN
 opt_regexpmatch2