MIPS: Elide hole checks on KeyedLoads of holey double arrays

Port r14630 (124d01e7)

Original commit message:
Improves NavierStokes by about 5%

BUG=

Review URL: https://codereview.chromium.org/14762012

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14651 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/lithium-codegen-mips.cc

@@ -95,6 +95,12 @@ void LCodeGen::FinishCode(Handle<Code> code) {
     transition_maps_.at(i)->AddDependentCode(
         DependentCode::kTransitionGroup, code);
   }
+  if (graph()->depends_on_empty_array_proto_elements()) {
+    isolate()->initial_object_prototype()->map()->AddDependentCode(
+        DependentCode::kElementsCantBeAddedGroup, code);
+    isolate()->initial_array_prototype()->map()->AddDependentCode(
+        DependentCode::kElementsCantBeAddedGroup, code);
+  }
 }