Apply numeric casts correctly in typed arrays and related code.

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index 99c575f22706f917836199ff4de7e45841a939fc..23d6d95fb50046840702040fb54fb260786f10f8 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -365,6 +365,7 @@ namespace internal {
   F(ArrayBufferGetByteLength, 1, 1)\
   F(ArrayBufferSliceImpl, 3, 1) \
   F(ArrayBufferIsView, 1, 1) \
+  F(ArrayBufferNeuter, 1, 1) \
   \
   F(TypedArrayInitialize, 5, 1) \
   F(TypedArrayInitializeFromArrayLike, 4, 1) \
@@ -828,6 +829,8 @@ class Runtime : public AllStatic {
       size_t allocated_length,
       bool initialize = true);
 
+  static void NeuterArrayBuffer(Handle<JSArrayBuffer> array_buffer);
+
   static void FreeArrayBuffer(
       Isolate* isolate,
       JSArrayBuffer* phantom_array_buffer);