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

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 9feef1b9146fffcc1f31919d8919532bc6f0c7d7..13c5fa51fda9e8e7d390e69a1ba2d3b64c4313cd 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -4537,11 +4537,11 @@ 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);
 }