Revert of [compiler] Drop the CompareNilIC.

src/full-codegen/x64/full-codegen-x64.cc

Index: src/full-codegen/x64/full-codegen-x64.cc
diff --git a/src/full-codegen/x64/full-codegen-x64.cc b/src/full-codegen/x64/full-codegen-x64.cc
index 39862bc4d39cea38c63adf8a83ae7a218ce61909..910b2cf9f062b578ba7d26d74943e85c3a1856d9 100644
--- a/src/full-codegen/x64/full-codegen-x64.cc
+++ b/src/full-codegen/x64/full-codegen-x64.cc
@@ -3919,11 +3919,10 @@
     __ CompareRoot(rax, nil_value);
     Split(equal, if_true, if_false, fall_through);
   } else {
-    __ JumpIfSmi(rax, if_false);
-    __ movp(rax, FieldOperand(rax, HeapObject::kMapOffset));
-    __ testb(FieldOperand(rax, Map::kBitFieldOffset),
-             Immediate(1 << Map::kIsUndetectable));
-    Split(not_zero, if_true, if_false, fall_through);
+    Handle<Code> ic = CompareNilICStub::GetUninitialized(isolate(), nil);
+    CallIC(ic, expr->CompareOperationFeedbackId());
+    __ CompareRoot(rax, Heap::kTrueValueRootIndex);
+    Split(equal, if_true, if_false, fall_through);
   }
   context()->Plug(if_true, if_false);
 }