Revert of [compiler] Drop the CompareNilIC.

src/ic/ic.h

Index: src/ic/ic.h
diff --git a/src/ic/ic.h b/src/ic/ic.h
index 4f07e867d1518298a465e35992f26bafd5eef4b1..2ce182b76e4ede86d11ca9df82399eff333f8492 100644
--- a/src/ic/ic.h
+++ b/src/ic/ic.h
@@ -624,6 +624,18 @@
 };
 
 
+class CompareNilIC : public IC {
+ public:
+  explicit CompareNilIC(Isolate* isolate) : IC(EXTRA_CALL_FRAME, isolate) {}
+
+  Handle<Object> CompareNil(Handle<Object> object);
+
+  static Handle<Code> GetUninitialized();
+
+  static void Clear(Address address, Code* target, Address constant_pool);
+};
+
+
 class ToBooleanIC : public IC {
  public:
   explicit ToBooleanIC(Isolate* isolate) : IC(EXTRA_CALL_FRAME, isolate) {}