Remove some unnecessary code from ClassLinker.

Remove local variables named `extend_super_iftable` that
were used for `is_super && extend_super_iftable` where
the left-hand size being true implied the right-hand side
is also being true.

Remove `ArtMethod::GetInterfaceMethodIfProxy()` call on an
interface method that cannot be a proxy method.

Test: m test-art-host-gtest
Test: testrunner.py --host --optimizing
Bug: 181943478
Change-Id: If296e9b137d435e8535d45419a319a8c5c47d7a9
1 file changed