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_core.h b/vm_core.h
index 0120f21831..d5e18ba489 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -550,6 +550,7 @@ enum ruby_basic_operators {
     BOP_LENGTH,
     BOP_SIZE,
     BOP_EMPTY_P,
+    BOP_NIL_P,
     BOP_SUCC,
     BOP_GT,
     BOP_GE,