[IR] Add nocapture & nosync to matrix intrinsics.

As suggested in D81472, the load/store intrinsics' pointer arguments can
be marked as nocapture and all matrix intrinsics as nosync.

This also re-flows the intrinsic definitions, to make them a little more
concise.

GitOrigin-RevId: 1d33c09f220ea9fe2846813bafc46dc5d9394577
3 files changed