Merge releaseBufferEndpoint in LayerState

If T1 has a buffer update and gets merged into T2, where T2 modified the
same SC, we need to ensure releaseBufferEndpoint is also merged.

Test: split, pip
Fixes: 196198502
Change-Id: I836d32f4c439235a91a4c933a1b477813f6726a2
1 file changed