Add verification stress test.

This is more a benchmark than a real test. It highlights a pattern where Art's
verifier is currently slower than Dalvik's verifier.

Bug: 12126841
Change-Id: I1ed6466798696b0aa04b94edac2d2b9d0015c6a2
Fix 64-bit CAS for x86.

Bug: 12117970
Change-Id: I9fbba2291124a2594161782c89dc62201cf01c08
Move DEX2OAT_DEPENDENCY to the build project

Change-Id: I1c87640baa681ed5f0bc10bca8dc130895bb6a95

Conflicts:
	build/Android.oat.mk