xe: jit: gemm: remove mixing of oneDNN and gemmstone code

[rjoursler]

As a side-effect, also enables targeting an out-of-tree gemmstone by setting ONEDNN_GEMMSTONE_DIR.

[rjoursler]

make test
disable device_cpu
disable device_gpu

[petercad]

@rjoursler Is the idea to then move gemmstone to the third-party directory? The directories are getting buried pretty deep :)

[rjoursler]

@rjoursler Is the idea to then move gemmstone to the third-party directory?

That is the basic idea, or more accurately, to get that process started. According to this comment, there is likely a bit too much entanglement between the projects to move into the proposed thirdparty location.

The directories are getting buried pretty deep :)

Do you have a preferred location? I had considered moving this gpu/intel/jit/gemmstone or even gpu/intel/gemmstone, but wasn't sure on developers opinions.

[petercad]

Do you have a preferred location? I had considered moving this gpu/intel/jit/gemmstone or even gpu/intel/gemmstone, but wasn't sure on developers opinions.

gpu/intel/jit/gemmstone is fine by me, but of course it doesn't matter much if we're going to move gemmstone to third_party "really soon." FYI, OV has to modify a bit of code on their side every time we move gemmstone around, so it's probably best to delay this PR until rls-v3.7 is branched.