This is in preparation for adding the KHR version of the cooperative
matrix extension, `SPV_KHR_cooperative_matrix`, that comes with
equivalent ops and type. These are not cross-extension compatible,
so it's better to add prefixes/suffixes to the Nvidia one,
`SPV_NV_cooperative_matrix`, before adding the KHR counterparts.
In near future, I plan for these two extensions to co-exist in
the SPIR-V dialect, but we may want to remove the NV one at some point.
Reviewed By: antiagainst
Differential Revision: https://reviews.llvm.org/D154799
1d51597870