Auto merge of #114875 - Zalathar:line-numbers, r=ozkanonur

coverage: Anonymize line numbers in `run-coverage` test snapshots

LLVM's coverage reporter always prints line numbers in its coverage reports.

For testing purposes this is slightly inconvenient, because it means that adding or removing a line in a test file causes all subsequent lines in the snapshot to change. That makes it harder to see the actually meaningful changes in the re-blessed snapshot.

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This change fixes that by adding another normalization pass that replaces all line numbers in the coverage reports with `LL`, which is similar to what UI tests tell the compiler to do when emitting line numbers in error messages.

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