PR #11631: Cleanup passes names
PR #11631: Cleanup passes names

Imported from GitHub PR https://github.com/openxla/xla/pull/11631

I found couple passes with simple `absl::string_view name()` implementation which were defined in cc files.
All other passes define `name()` in header file. (Unless name() impl requires if/switch block)

This PR makes simple `absl::string_view name()` implementation consistent across all passes.
Copybara import of the project:

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d53f3da013b68002f1cca9370a5618051f819cf5 by Alexander Pivovarov <pivovaa@amazon.com>:

Cleanup passes names

Merging this change closes #11631

FUTURE_COPYBARA_INTEGRATE_REVIEW=https://github.com/openxla/xla/pull/11631 from apivovarov:cleanup_passes_names d53f3da013b68002f1cca9370a5618051f819cf5
