Lazily save double registers for HCallRuntime instructions within Hydrogen code stubs.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index d677772ece9719e43ce54cd7c5dfd0f1dc4d9373..1fb542f15f8508365fb2fa6d7ed180f602b89570 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -637,13 +637,15 @@ void LCodeGen::CallCode(Handle<Code> code,
 
 void LCodeGen::CallRuntime(const Runtime::Function* function,
                            int num_arguments,
-                           LInstruction* instr) {
+                           LInstruction* instr,
+                           SaveFPRegsMode save_doubles) {
   ASSERT(instr != NULL);
   ASSERT(instr->HasPointerMap());
   LPointerMap* pointers = instr->pointer_map();
   RecordPosition(pointers->position());
 
-  __ CallRuntime(function, num_arguments);
+  __ CallRuntime(function, num_arguments, save_doubles);
+
   RecordSafepointWithLazyDeopt(instr, RECORD_SIMPLE_SAFEPOINT, 0);
 }
 
@@ -3906,7 +3908,7 @@ void LCodeGen::DoCallNewArray(LCallNewArray* instr) {
 
 
 void LCodeGen::DoCallRuntime(LCallRuntime* instr) {
-  CallRuntime(instr->function(), instr->arity(), instr);
+  CallRuntime(instr->function(), instr->arity(), instr, instr->save_doubles());
 }