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 f35c7776b21d64eb6135f7cff1a498bd0b56a2b5..a6a25261ea446c6457a16bea6521f0e468e80e07 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -277,10 +277,9 @@ class LInstruction : public ZoneObject {
   bool ClobbersRegisters() const { return IsCall(); }
   virtual bool ClobbersDoubleRegisters() const {
     return IsCall() ||
-      (!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;
@@ -1542,11 +1541,6 @@ class LLoadNamedField V8_FINAL : 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")
@@ -2206,8 +2200,6 @@ class LNumberUntagD V8_FINAL : public LTemplateInstruction<1, 1, 1> {
   LOperand* value() { return inputs_[0]; }
   LOperand* temp() { return temps_[0]; }
 
-  virtual bool ClobbersDoubleRegisters() const V8_OVERRIDE { return false; }
-
   DECLARE_CONCRETE_INSTRUCTION(NumberUntagD, "double-untag")
   DECLARE_HYDROGEN_ACCESSOR(Change);
 };