OpenJDK 11: Merging in java.lang.Integer (parseInt() CharSequence)

This is part of merging upstream changes from OpenJDK 11.28. This CL
adds new API parseInt(CharSequence, int, int, int); and adds
corresponding unit tests.

Bug: 207841289
Test: atest CtsLibcoreOjTestCases:test.java.lang.Integer.ParsingTest
Change-Id: I4c6caea8e9b66acf84512bd38c386401dd6ce7ad
4 files changed