PR #12494: [ROCM] GPU performance cost model specs for MI300
PR #12494: [ROCM] GPU performance cost model specs for MI300

Imported from GitHub PR https://github.com/openxla/xla/pull/12494

@ddunl  @xla-rotation  : would you take a look please?
Copybara import of the project:

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265d19a155907357fe89ff4e0f5dbbe52f329c4c by Ruturaj4 <ruturaj.vaidya@amd.com>:

[ROCm] set performance cost model specifications for mi300

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0f0a6fa282bf4ce729d8f4d570fa9a1d6f8fad50 by Ruturaj4 <ruturaj.vaidya@amd.com>:

[ROCm] set performance cost model specifications for mi100 and mi200

Merging this change closes #12494

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/12494 from ROCm:ci_perf_cost_model 0f0a6fa282bf4ce729d8f4d570fa9a1d6f8fad50
