Revert "Revert "Add a specialized instruction for `.nil?` calls""

This reverts commit a0980f2446c0db735b8ffeb37e241370c458a626.

Retry for macOS Mojave.

1 files changed, 1 insertions, 0 deletions

diff --git a/compile.c b/compile.c
index 774dadfc79..0dbefd3155 100644
--- a/compile.c
+++ b/compile.c
@@ -3255,6 +3255,7 @@ iseq_specialized_instruction(rb_iseq_t *iseq, INSN *iobj)
 		  case idLength: SP_INSN(length); return COMPILE_OK;
 		  case idSize:	 SP_INSN(size);	  return COMPILE_OK;
 		  case idEmptyP: SP_INSN(empty_p);return COMPILE_OK;
+                  case idNilP:   SP_INSN(nil_p);  return COMPILE_OK;
 		  case idSucc:	 SP_INSN(succ);	  return COMPILE_OK;
 		  case idNot:	 SP_INSN(not);	  return COMPILE_OK;
 		}