Remove special handling of fields in combination with elements transitions in Crankshaft.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 3ddad068bfdfc0454442a87e3fd964269d5e6298..c1290fe3d27f8da24d87ada3cc39adb7aeeee873 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -3163,9 +3163,6 @@ static bool CompactEmit(SmallMapList* list,
                         int i,
                         Isolate* isolate) {
   Handle<Map> map = list->at(i);
-  // If the map has ElementsKind transitions, we will generate map checks
-  // for each kind in __ CompareMap(..., ALLOW_ELEMENTS_TRANSITION_MAPS).
-  if (map->HasElementsTransition()) return false;
   LookupResult lookup(isolate);
   map->LookupDescriptor(NULL, *name, &lookup);
   return lookup.IsField() || lookup.IsConstant();