[AMDGPU] Skip bridge copies for grouped MFMA instructions (#198555) When the MFMA-form rewrite moves a chain of matrix ops from VGPR to AGPR form, the bridges between ops in the chain don't exist post-rewrite, instead they all live in AGPR-form together. The cost model was counting those phantom bridges and rejecting rewrites that were actually profitable. Treat the candidate set as a group. Edges inside the group need no bridge. Skip candidates whose results escape to non-matrix users. Co-author: Vlad Romanov <Vladislav.Romanov@amd.com>
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