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Eliminate a mem::transmute in CodeGen by changing the find_enum_string_index function to take a slice of pairs and return an enum value.
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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix#15587 (github issue number if applicable).
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- [ ] There are tests for these changes OR
- [X] These changes do not require tests because _____
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Source-Repo: https://github.com/servo/servo
Source-Revision: af6353df87770c6d616facdc07f9f929e99b9eda
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 42992b500828053caff27a6ee20ca35f0f42f2d5