Rollup merge of #156129 - Zalathar:pass-fail, r=jieyouxu compiletest: Migrate from `PassMode`/`FailMode` to `PassFailMode` Every UI test has an explicit or implicit “pass/fail mode” (e.g. `check-fail` or `build-pass`) that was historically stored in two separate optional fields (`pass_mode` and `fail_mode`). That split made it very hard to determine how the respective values were actually produced and consumed, especially in the presence of `--pass=check` on the command-line, or when building auxiliary crates. This PR replaces the separate fields and enums for pass-mode and fail-mode with a single `PassFailMode` enum and a single `pass_fail_mode` field. With this new representation, it should hopefully be easier to understand and modify the pass/fail-mode logic. --- In order to focus on the main migration, I have mostly refrained from subsequent cleanups. r? jieyouxu
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