Add X87 implementations for Integer32ToDouble, DoubleToI, DoubleToSmi

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 6b0f9d0a74cf82752a2bdebec82394be609f2971..de4ede95761e1a37238f5f25e992c2a5c57bb020 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -263,10 +263,9 @@ class LInstruction: public ZoneObject {
   bool ClobbersRegisters() const { return is_call_; }
   virtual bool ClobbersDoubleRegisters() const {
     return is_call_ ||
-      (!CpuFeatures::IsSupported(SSE2) &&
-       // We only have rudimentary X87Stack tracking, thus in general
-       // cannot handle deoptimization nor phi-nodes.
-       (HasEnvironment() || IsControl()));
+           // We only have rudimentary X87Stack tracking, thus in general
+           // cannot handle phi-nodes.
+           (!CpuFeatures::IsSafeForSnapshot(SSE2) && IsControl());
   }
 
   virtual bool HasResult() const = 0;
@@ -1511,11 +1510,6 @@ class LLoadNamedField: public LTemplateInstruction<1, 1, 0> {
     inputs_[0] = object;
   }
 
-  virtual bool ClobbersDoubleRegisters() const {
-    return !CpuFeatures::IsSupported(SSE2) &&
-        !hydrogen()->representation().IsDouble();
-  }
-
   LOperand* object() { return inputs_[0]; }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadNamedField, "load-named-field")
@@ -1598,11 +1592,6 @@ class LLoadKeyed: public LTemplateInstruction<1, 2, 0> {
     return hydrogen()->is_external();
   }
 
-  virtual bool ClobbersDoubleRegisters() const {
-    return !CpuFeatures::IsSupported(SSE2) &&
-        !IsDoubleOrFloatElementsKind(hydrogen()->elements_kind());
-  }
-
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyed, "load-keyed")
   DECLARE_HYDROGEN_ACCESSOR(LoadKeyed)
 
@@ -2189,8 +2178,6 @@ class LNumberUntagD: public LTemplateInstruction<1, 1, 1> {
   LOperand* value() { return inputs_[0]; }
   LOperand* temp() { return temps_[0]; }
 
-  virtual bool ClobbersDoubleRegisters() const { return false; }
-
   DECLARE_CONCRETE_INSTRUCTION(NumberUntagD, "double-untag")
   DECLARE_HYDROGEN_ACCESSOR(Change);
 };