Introduce HTransitionElementsKind instruction.

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 27a96674cf7d02c8d40235e8e8549c6f6f3c1985..901764fc1d3b30c1e69117d6b76ad0e08ceb3361 100644
--- a/src/x64/ic-x64.cc
+++ b/src/x64/ic-x64.cc
@@ -1602,6 +1602,37 @@ void KeyedStoreIC::GenerateMiss(MacroAssembler* masm, bool force_generic) {
 }
 
 
+void KeyedStoreIC::GenerateTransitionElementsSmiToDouble(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rdx     : receiver
+  //  -- rsp[0]  : return address
+  // -----------------------------------
+  // Must return the modified receiver in eax.
+
+  __ pop(rbx);
+  __ push(rdx);
+  __ push(rbx);  // return address
+
+  __ TailCallRuntime(Runtime::kTransitionElementsSmiToDouble, 1, 1);
+}
+
+
+void KeyedStoreIC::GenerateTransitionElementsDoubleToObject(
+    MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rdx     : receiver
+  //  -- rsp[0]  : return address
+  // -----------------------------------
+  // Must return the modified receiver in eax.
+
+  __ pop(rbx);
+  __ push(rdx);
+  __ push(rbx);  // return address
+
+  __ TailCallRuntime(Runtime::kTransitionElementsDoubleToObject, 1, 1);
+}
+
+
 #undef __