PR #10390: Split FP8 And Non-FP8 GEMM Rewriters
PR #10390: Split FP8 And Non-FP8 GEMM Rewriters

Imported from GitHub PR https://github.com/openxla/xla/pull/10390

Separates the rewriters for FP8 and non-FP8 GEMMs and moves the rewrite of FP8 GEMMs ahead of the Triton GEMM rewriter.
Copybara import of the project:

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ee321f056e816191e960ec9aab882b077aad6f55 by Philipp Hack <phack@nvidia.com>:

Separates the rewriters for FP8 and non-FP8 GEMMs.

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488e7cde2b8fd6351c0cfa4a9359d7b47aca596b by Philipp Hack <phack@nvidia.com>:

Separates the rewriters for FP8 and non-FP8 GEMMs.

Merging this change closes #10390

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10390 from philipphack:u_fp8_rewriter_split_xla 488e7cde2b8fd6351c0cfa4a9359d7b47aca596b
