Unnecessay SSE2 check on x64

src/x64/stub-cache-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2227 matching lines @@
     Handle<JSFunction> function,
     Handle<String> name,
     Code::StubType type) {
   // ----------- S t a t e -------------
   //  -- rcx                 : name
   //  -- rsp[0]              : return address
   //  -- rsp[(argc - n) * 4] : arg[n] (zero-based)
   //  -- ...
   //  -- rsp[(argc + 1) * 4] : receiver
   // -----------------------------------
-
-  if (!CpuFeatures::IsSupported(SSE2)) {
-    return Handle<Code>::null();
-  }
-
-  CpuFeatureScope use_sse2(masm(), SSE2);
-
   const int argc = arguments().immediate();
 
   // If the object is not a JSObject or we got an unexpected number of
   // arguments, bail out to the regular call.
   if (!object->IsJSObject() || argc != 1) {
     return Handle<Code>::null();
   }
 
   Label miss;
   GenerateNameCheck(name, &miss);
@@ skipping 904 matching lines @@
   // -----------------------------------
   TailCallBuiltin(masm, Builtins::kKeyedLoadIC_MissForceGeneric);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64