Add LoadIC_Slow builtin and use it for loading properties from primitive values.

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 6425f894164db5d2c27faf4341bbef67719dbcc7..efb41c85ec107830b7da309430d91eaeea57e5ee 100644
--- a/src/x64/ic-x64.cc
+++ b/src/x64/ic-x64.cc
@@ -1380,6 +1380,23 @@ void LoadIC::GenerateMiss(MacroAssembler* masm) {
 }
 
 
+void LoadIC::GenerateRuntimeGetProperty(MacroAssembler* masm) {
+  // ----------- S t a t e -------------
+  //  -- rax    : receiver
+  //  -- rcx    : name
+  //  -- rsp[0]  : return address
+  // -----------------------------------
+
+  __ pop(rbx);
+  __ push(rax);  // receiver
+  __ push(rcx);  // name
+  __ push(rbx);  // return address
+
+  // Perform tail call to the entry.
+  __ TailCallRuntime(Runtime::kGetProperty, 2, 1);
+}
+
+
 void KeyedLoadIC::GenerateMiss(MacroAssembler* masm, ICMissMode miss_mode) {
   // ----------- S t a t e -------------
   //  -- rax    : key