Collect verifier dependencies

MethodVerifier tests whether a DEX method is valid w.r.t. the classes
in class path. Since the APK does not change across OTA updates, it
is not necessary to analyze the bytecode again with MethodVerifier,
as long as its dependencies on the class path (which may have changed)
are satisfied.

This patch introduces VerifierDeps, a class path dependency collector,
and adds hooks into MethodVerifier where classes/methods/fields are
resolved and where assignability of types is tested.

Test: m test-art-host-gtest-verifier_deps_test
Bug: 30937355
Change-Id: Iee0b321d772a5c7d1cb471aaa6e13918310b7e2f