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Automatically fuse multiple reductions and pointwise operations.

* [MLIR] add dot offloads with manual tuning support
* This commit adds dot + pointwise fusion support
along with manual tuning using rocMLIR.

Avoids double global loads.  Strided loops are unrolled which lets store results in array which compiler will use registers for since the index access is constant.   Updated to handle large reductions so which results with a better stable diffusion result

JIT implementation of the gather operator
Added a few more unit tests to this one as well since I saw some odd behavior during bring up.

Update dialect registration interface
Update 2nd build pipeline call and use full arch name

Can be enabled via environment variable MIGRAPHX_ENABLE_NHWC