Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/src/ic/ic-compiler.cc b/src/ic/ic-compiler.cc
index ae4b2a5..f74c69e 100644
--- a/src/ic/ic-compiler.cc
+++ b/src/ic/ic-compiler.cc
@@ -43,13 +43,11 @@
   // stub code needs to check that dynamically anyway.
   bool convert_hole_to_undefined =
       is_js_array && elements_kind == FAST_HOLEY_ELEMENTS &&
-      *receiver_map == isolate->get_initial_js_array_map(elements_kind) &&
-      !(is_strong(LoadICState::GetLanguageMode(extra_ic_state)));
+      *receiver_map == isolate->get_initial_js_array_map(elements_kind);
   Handle<Code> stub;
   if (receiver_map->has_indexed_interceptor()) {
     stub = LoadIndexedInterceptorStub(isolate).GetCode();
   } else if (receiver_map->IsStringMap()) {
-    // We have a string.
     stub = LoadIndexedStringStub(isolate).GetCode();
   } else if (receiver_map->has_sloppy_arguments_elements()) {
     stub = KeyedLoadSloppyArgumentsStub(isolate).GetCode();
@@ -58,6 +56,7 @@
     stub = LoadFastElementStub(isolate, is_js_array, elements_kind,
                                convert_hole_to_undefined).GetCode();
   } else {
+    DCHECK(receiver_map->has_dictionary_elements());
     stub = LoadDictionaryElementStub(isolate, LoadICState(extra_ic_state))
                .GetCode();
   }