Reduce Integer allocations in ThreadLocalWorkSource

The code was allocating an Integer for each call of
ThreadLocalWorkSource.setUid().

Bug: 262916014
Test: atest binderLibTest BinderWorkSourceTest BinderProxyTest
Test: atest BinderCallsStatsServiceTest android.os.ParcelTest
Change-Id: I75ece3262bdebaf9d58aee9c355d22121ae09a40
1 file changed