[turbofan] Use CompareNilIC for abstract equality with null/undefined.

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index f28f46ba2dd02f87e7478610ee3246e6771cae23..a094022462df3372a1fc1d24f4b63dfe335eec91 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -4650,7 +4650,8 @@ void FullCodeGenerator::EmitLiteralCompareNil(CompareOperation* expr,
   } else {
     Handle<Code> ic = CompareNilICStub::GetUninitialized(isolate(), nil);
     CallIC(ic, expr->CompareOperationFeedbackId());
-    __ CompareAndSplit(x0, 0, ne, if_true, if_false, fall_through);
+    __ CompareRoot(x0, Heap::kTrueValueRootIndex);
+    Split(eq, if_true, if_false, fall_through);
   }
 
   context()->Plug(if_true, if_false);