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

src/builtins.cc

Index: src/builtins.cc
diff --git a/src/builtins.cc b/src/builtins.cc
index 37ba1e5301a9e17a9e5f4f026e0ad902bb03fd9d..3c6122ac6ed40a9d0603e2fdcd8a9882033dbb74 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -1466,6 +1466,11 @@ static void Generate_LoadIC_Getter_ForDeopt(MacroAssembler* masm) {
 }
 
 
+static void Generate_LoadIC_Slow(MacroAssembler* masm) {
+  LoadIC::GenerateRuntimeGetProperty(masm);
+}
+
+
 static void Generate_KeyedLoadIC_Initialize(MacroAssembler* masm) {
   KeyedLoadIC::GenerateInitialize(masm);
 }