OpenJDK 11: Merging in java.util.concurrent.atomic.AtomicInteger

This is part of merging upstream changes from OpenJDK 11.28. It
updates the AtomicInteger class. Its implementation makes use of
VarHandle.

Test: m
Test: atest CtsLibcoreOjTestCases
Bug: 188889082
Change-Id: Ic7f9a2dee273bf7ce22c7b4cc19b30a61d492a99
4 files changed