OpenJDK 11: Merging in java.lang.String (isBlank() method)

This is part of merging upstream changes from OpenJDK 11.28. This CL
increments vtable_entries count for newly added isBlank() method in
String class; and updates test expectations for 100-reflect2 test.

Bug: 202962059
Test: art/test/testrunner/testrunner.py --host -b -t 100-reflect2
Test: atest CtsLibcoreOjTestCases:test.java.lang.String.{IsBlank,Strip}
Change-Id: Ibf0bce0a7f97686aeefda241f8e8be59d3d2af3f
2 files changed