Truncate rather than round to nearest when performing float-to-integer...

src/stub-cache.h

Index: src/stub-cache.h
===================================================================
--- src/stub-cache.h	(revision 6406)
+++ src/stub-cache.h	(working copy)
@@ -167,6 +167,10 @@
   MUST_USE_RESULT static MaybeObject* ComputeKeyedStoreSpecialized(
       JSObject* receiver);
 
+  MUST_USE_RESULT static MaybeObject* ComputeKeyedLoadOrStoreExternalArray(
+      JSObject* receiver,
+      bool is_store);
+
   // ---
 
   MUST_USE_RESULT static MaybeObject* ComputeCallField(int argc,
@@ -797,6 +801,20 @@
   CallHandlerInfo* api_call_info_;
 };
 
+class ExternalArrayStubCompiler: public StubCompiler {
+ public:
+  explicit ExternalArrayStubCompiler() {}
+
+  MUST_USE_RESULT MaybeObject* CompileKeyedLoadStub(
+      ExternalArrayType array_type, Code::Flags flags);
+
+  MUST_USE_RESULT MaybeObject* CompileKeyedStoreStub(
+      ExternalArrayType array_type, Code::Flags flags);
+
+ private:
+  MaybeObject* GetCode(Code::Flags flags);
+};
+
 } }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_