Collapse ART's AbstractMethod class into Executable
After the OpenJDK 8 pull there is now a common base class
for Method and Constructor that can be used instead.
Methods that are abstract on Executable but on Android
were implemented in AbstractMethod are now consistently
renamed to "{method}Internal", declared final and
given package-protected access.
For consistency with all other private, natively
implemented methods, the method getDeclaredAnnotations()
has been renamed getDeclaredAnnotationsNative().
Bug:
28666126
Bug:
31052885
Test: make test-art-host and cts run of CtsLibcoreTestCases
Change-Id: Ibfe6af6a47fe0cfffd0859ffbe58980aeb84e053