Fix TBAA by inserting a distinct root node.

Bug: 20069947

We now create a distinct TBAA root node, so that we can easily swap the rest
of the RenderScript TBAA subtree into the simple C/C++ TBAA tree.

Change-Id: Ia9a862283c26a91c9cb3c8f96122979abcfbcbe6
2 files changed