Add a GTest for Assembly Stubs, Add some ARM64 and X86-64 Stubs

Add a GTest for Assembly Stubs, Add some ARM64 and X86-64 Stubs

This GTest adds some runtime testing for the stubs that does not
rely on the compiler. This should allow to add or update the stubs
and do testing, especially on architectures without working compiler.

This test is a bit dangerous: if it doesn't know how to handle an
architecture, it will only log a warning. This is so that testing
does not break at the moment. The warning is forced to stdout, too,
so that it is always visible.

Add art_quick_check_cast to ARM64 and X86-64. Add art_quick_memcpy
to X86-64. The latter should be removed in a good compiler, as it is
practically only overhead. Add minor CFI information in ARM.

Change-Id: Ia9c6d0f4035eb1527c12b5f6067dece59e25528d