Libcore: Fix or hide ConstantOverflow errorprone warnings

Hide ConstantOverflow in oj code and tests. Mark the warning as
suppressed in harmony tests.

Bug: 110155920
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: I3aacd13ea726eca999d6f4b64e1e74264bebc3af
3 files changed