AArch64: Fix cmp-long and method with long arguments.

1. Fix cmp-long.
2. Use single register to pass long argument.
3. Flush StackReference<ArtMethod> on arm64 the same as in common code.
3. Fix the mismatch in calculate reg offset.

Change-Id: Ie2723260fb143512e4da6ee88d4f3aded80d3d5e
4 files changed