rust: Add support for {armv7a,aarch64}-cros-linux asan

BUG=b:172702178
TEST=emerge rust

Change-Id: I5c42548df74029874a12458d69a37d379b4ad753
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2535614
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
4 files changed