Refresh SparseArray<> from the Google copy.

In particular, it now initialises memory in
order to avoid undefined behaviour.

Change-Id: If4a1ecfdd5703e6e965f19de3459dfb2973f16d8
Reviewed-on: https://code-review.googlesource.com/6731
Reviewed-by: Paul Wankadia <[email protected]>
1 file changed