Introduce intrinsics for double values in Javascript.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 55d19e05b264910d35bbc57202d55e7e46be7aa2..723bd4d3f8f9b9b5b6415b6d57a514aeb7b1d69d 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -10531,6 +10531,35 @@ void HOptimizedGraphBuilder::GenerateRegExpExec(CallRuntime* call) {
 }
 
 
+void HOptimizedGraphBuilder::GenerateDoubleLo(CallRuntime* call) {
+  ASSERT_EQ(1, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* value = Pop();
+  HInstruction* result = NewUncasted<HDoubleBits>(value, HDoubleBits::LOW);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
+void HOptimizedGraphBuilder::GenerateDoubleHi(CallRuntime* call) {
+  ASSERT_EQ(1, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* value = Pop();
+  HInstruction* result = NewUncasted<HDoubleBits>(value, HDoubleBits::HIGH);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
+void HOptimizedGraphBuilder::GenerateConstructDouble(CallRuntime* call) {
+  ASSERT_EQ(2, call->arguments()->length());
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(1)));
+  HValue* lo = Pop();
+  HValue* hi = Pop();
+  HInstruction* result = NewUncasted<HConstructDouble>(hi, lo);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 // Construct a RegExp exec result with two in-object properties.
 void HOptimizedGraphBuilder::GenerateRegExpConstructResult(CallRuntime* call) {
   ASSERT_EQ(3, call->arguments()->length());