Libcore: Suppress InvalidPatternSyntax warning in tests

The tests exercises a unusual orwrong patterns to test corner cases
and exception paths. Ignore the errorprone warning.

Bug: 72451126
Test: m javac-check RUN_ERROR_PRONE=true
Change-Id: I710b9d7ee2d5379b31f3dde5a04d35ea22c5d7b8
2 files changed