[turbofan] Properly implement %_ClassOf intrinsic.

src/compiler/linkage.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/linkage.h"
 
 #include "src/ast/scopes.h"
 #include "src/code-stubs.h"
 #include "src/compilation-info.h"
 #include "src/compiler/common-operator.h"
@@ skipping 153 matching lines @@
     case Runtime::kStringLessThan:
     case Runtime::kStringLessThanOrEqual:
     case Runtime::kStringGreaterThan:
     case Runtime::kStringGreaterThanOrEqual:
     case Runtime::kToFastProperties:  // TODO(conradw): Is it safe?
     case Runtime::kTraceEnter:
     case Runtime::kTraceExit:
       return false;
 
     // Some inline intrinsics are also safe to call without a FrameState.
+    case Runtime::kInlineClassOf:
     case Runtime::kInlineCreateIterResultObject:
     case Runtime::kInlineFixedArrayGet:
     case Runtime::kInlineFixedArraySet:
     case Runtime::kInlineGeneratorClose:
     case Runtime::kInlineGeneratorGetInputOrDebugPos:
     case Runtime::kInlineGeneratorGetResumeMode:
     case Runtime::kInlineIsArray:
     case Runtime::kInlineIsJSReceiver:
     case Runtime::kInlineIsRegExp:
     case Runtime::kInlineIsSmi:
@@ skipping 320 matching lines @@
     DCHECK(loc == regloc(kContextRegister, MachineType::AnyTagged()));
     return LinkageLocation::ForCalleeFrameSlot(Frame::kContextSlot,
                                                MachineType::AnyTagged());
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8