Reduce instructions required to obtain and recycle TypedArray

Eliminates several field and method accesses by making the TypedArray
pool local to a single Resources object. Removes an unnecessary
synchronization.

ReadXmlAttrs averaged 0.069 ms/op before, 0.064 ms/op after.

BUG: 17484798
Change-Id: If790a5ba6596b47a04f117c8912974798a592052