Revert r13025 and r13026 (they introduced a bug on arm and regressed octane crypto).

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 2b2cafbe3786c641472e1bd98ed8aa1ac39d0a66..3e19c39ba24de278a78f128739f899402e46735a 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -4770,11 +4770,11 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   SmallMapList* map_set = instr->hydrogen()->map_set();
   for (int i = 0; i < map_set->length() - 1; i++) {
     Handle<Map> map = map_set->at(i);
-    __ CompareMap(reg, map, &success, instr->hydrogen()->mode());
+    __ CompareMap(reg, map, &success, REQUIRE_EXACT_MAP);
     __ j(equal, &success);
   }
   Handle<Map> map = map_set->last();
-  DoCheckMapCommon(reg, map, instr->hydrogen()->mode(), instr->environment());
+  DoCheckMapCommon(reg, map, REQUIRE_EXACT_MAP, instr->environment());
   __ bind(&success);
 }