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/vm.c b/vm.c
index 115bdca503..b4e2e3c5e6 100644
--- a/vm.c
+++ b/vm.c
@@ -1656,6 +1656,7 @@ vm_init_redefined_flag(void)
     OP(Call, CALL), (C(Proc));
     OP(And, AND), (C(Integer));
     OP(Or, OR), (C(Integer));
+    OP(NilP, NIL_P), (C(NilClass));
 #undef C
 #undef OP
 }