Mark armv6m compat with armv7em; match armv7em being compat with armv6m

armv7em and armv6m in ArchSpec cores_match() will return true.
There was a small bug where the reverse order would not return true.

rdar://76387176

GitOrigin-RevId: 01ad95ff2a7cc127eddf3832693bbd5c6c54f9ef
1 file changed