Add initial integration of amdmlss mha #4303
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Motivation
To be able to use amdmlss library selected kernels
Technical Details
Adds mlss_mha operator, fuse_mlss pass, and mlss jit compiler files as initial proposal of instruction replacement to support mlss_mha kernels from amdmlss. Bypassing the current MHA operator decomposition into separate instructions that uses mlir kernels.
A first step at integrating amdmlss kernels into MIGraphX