[x64] Make r12 allocatable.

src/x64/deoptimizer-x64.cc

 // Copyright 2012 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/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
@@ skipping 289 matching lines @@
     // and overwrite this afterwards.
     if (r.is(rsp)) {
       DCHECK(i > 0);
       r = Register::from_code(i - 1);
     }
     __ popq(r);
   }
 
   // Set up the roots register.
   __ InitializeRootRegister();
-  __ InitializeSmiConstantRegister();
 
   // Return to the continuation point.
   __ ret(0);
 }
 
 
 void Deoptimizer::TableEntryGenerator::GeneratePrologue() {
   // Create a sequence of deoptimization entries.
   Label done;
   for (int i = 0; i < count(); i++) {
@@ skipping 30 matching lines @@
   UNREACHABLE();
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64