Workaround for coverage of java.util.function.Predicate.not()

Predicate.not() is one of the backports emitted by d8 when the API
level is less than T. This happens in Android's infra so we wrap
invocation of Predicate.not() in the test with a MethodHandle
invocation so Predicate.not() correctly appears to have coverage in
the coverage dashboard.

Bug: 191859202
Fix: 226628342
Test: atest CtsLibcoreOjTestCases:test.java.util.function.PredicateNotTest
Change-Id: Ieee7c754b260877bea9e3f95a82c6e97a97ff488
1 file changed