PR #10628: Exclude FP8 Conversions in DotOperandConverter
PR #10628: Exclude FP8 Conversions in DotOperandConverter

Imported from GitHub PR https://github.com/openxla/xla/pull/10628

Excludes conversions of dot operands between F8E4M3FN and F8E5M2 types in the DotOperandConverter pass.
Copybara import of the project:

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037add4423247836b743537f08be563719294c45 by Philipp Hack <phack@nvidia.com>:

Excludes conversions of dot operands between FP8 types.

Merging this change closes #10628

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/10628 from philipphack:u_fp8_operand_converter_xla 037add4423247836b743537f08be563719294c45
