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

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

Index: src/crankshaft/mips/lithium-codegen-mips.cc
diff --git a/src/crankshaft/mips/lithium-codegen-mips.cc b/src/crankshaft/mips/lithium-codegen-mips.cc
index 4c8b439120533a2beefbcf00f5be752785d06cbc..a2eaa4f496fcb37b928c4e253d7abe562fec433e 100644
--- a/src/crankshaft/mips/lithium-codegen-mips.cc
+++ b/src/crankshaft/mips/lithium-codegen-mips.cc
@@ -5474,7 +5474,7 @@ 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);
 }