Fast elements conversions in crankshaft using generated code.

src/x64/ic-x64.cc

Index: src/x64/ic-x64.cc
diff --git a/src/x64/ic-x64.cc b/src/x64/ic-x64.cc
index c398723ab1927fa52a15f856867acdff1fa91f06..8c9f6470c881f249c433b6d825fe693080e5d5f2 100644
--- a/src/x64/ic-x64.cc
+++ b/src/x64/ic-x64.cc
@@ -1608,11 +1608,8 @@ void KeyedStoreIC::GenerateTransitionElementsSmiToDouble(MacroAssembler* masm) {
   // -----------------------------------
   // Must return the modified receiver in eax.
 
-  __ pop(rbx);
-  __ push(rdx);
-  __ push(rbx);  // return address
-
-  __ TailCallRuntime(Runtime::kTransitionElementsSmiToDouble, 1, 1);
+  FastElementsConversionStub::GenerateSmiOnlyToDouble(
+      masm, FastElementsConversionStub::TRANSITION_ONLY);
 }
 
 
@@ -1624,11 +1621,8 @@ void KeyedStoreIC::GenerateTransitionElementsDoubleToObject(
   // -----------------------------------
   // Must return the modified receiver in eax.
 
-  __ pop(rbx);
-  __ push(rdx);
-  __ push(rbx);  // return address
-
-  __ TailCallRuntime(Runtime::kTransitionElementsDoubleToObject, 1, 1);
+  FastElementsConversionStub::GenerateDoubleToObject(
+      masm, FastElementsConversionStub::TRANSITION_ONLY);
 }