[turbofan] Add support for storing to double fields.

src/compiler/common-operator.h

Index: src/compiler/common-operator.h
diff --git a/src/compiler/common-operator.h b/src/compiler/common-operator.h
index 2b6beb88a405e0c59e5e792e589f7279d15c0bae..2ef2880f6d852825777c9f3814b82013ee767a3f 100644
--- a/src/compiler/common-operator.h
+++ b/src/compiler/common-operator.h
@@ -14,6 +14,10 @@ namespace internal {
 
 // Forward declarations.
 class ExternalReference;
+template <class>
+class TypeImpl;
+struct ZoneTypeConfig;
+typedef TypeImpl<ZoneTypeConfig> Type;
 
 
 namespace compiler {
@@ -145,6 +149,7 @@ class CommonOperatorBuilder final : public ZoneObject {
   const Operator* Phi(MachineType type, int value_input_count);
   const Operator* EffectPhi(int effect_input_count);
   const Operator* EffectSet(int arguments);
+  const Operator* Guard(Type* type);
   const Operator* BeginRegion();
   const Operator* FinishRegion();
   const Operator* StateValues(int arguments);