[for-in] Further refactorings and unification around for-in.

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index a4c38a1c495662a9bceeee37153892e9f983cdbd..e50c095b6919b2cfcf121080ec291441d3795fd5 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -5683,7 +5683,7 @@ void LCodeGen::DoForInPrepareMap(LForInPrepareMap* instr) {
   // Get the set of properties to enumerate.
   __ bind(&call_runtime);
   __ push(object);
-  CallRuntime(Runtime::kGetPropertyNamesFast, instr);
+  CallRuntime(Runtime::kForInEnumerate, instr);
   __ bind(&use_cache);
 }