[turbofan] Add support for storing to double fields.

src/compiler/common-operator.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/common-operator.h"
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
@@ skipping 653 matching lines @@
       break;
   }
   // Uncached.
   return new (zone()) Operator(               // --
       IrOpcode::kEffectPhi, Operator::kPure,  // opcode
       "EffectPhi",                            // name
       0, effect_input_count, 1, 0, 1, 0);     // counts
 }
 
 
+const Operator* CommonOperatorBuilder::Guard(Type* type) {
+  return new (zone()) Operator1<Type*>(      // --
+      IrOpcode::kGuard, Operator::kKontrol,  // opcode
+      "Guard",                               // name
+      1, 0, 1, 1, 0, 0,                      // counts
+      type);                                 // parameter
+}
+
+
 const Operator* CommonOperatorBuilder::EffectSet(int arguments) {
   DCHECK(arguments > 1);                      // Disallow empty/singleton sets.
   return new (zone()) Operator(               // --
       IrOpcode::kEffectSet, Operator::kPure,  // opcode
       "EffectSet",                            // name
       0, arguments, 0, 0, 1, 0);              // counts
 }
 
 
 const Operator* CommonOperatorBuilder::StateValues(int arguments) {
@@ skipping 122 matching lines @@
     Handle<SharedFunctionInfo> shared_info,
     ContextCallingMode context_calling_mode) {
   return new (zone()->New(sizeof(FrameStateFunctionInfo)))
       FrameStateFunctionInfo(type, parameter_count, local_count, shared_info,
                              context_calling_mode);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8