Auto merge of #96517 - ferrocene:pa-files-related-to-test, r=Mark-Simulacrum

[compiletest] Extract code to detect files related to a test into a different function

In the code that checks whether a test needs to be re-executed, compiletest checks the modification date of all the files related to the test. I need the list of files related to the test for other purposes inside compiletest, and while I could copy/paste the code `is_up_to_date` runs, that would produce incomplete results if more related files are added in the future.

This PR extracts the code to detect related files into a separate function, allowing the rest of compiletest to access the same data.

r? `@Mark-Simulacrum`

0 files changed, 0 insertions, 0 deletions