Trevor Gross 6b1b68f4ee
Rollup merge of #144356 - GuillaumeGomez:gcc-ignore-tests, r=jieyouxu
Add `ignore-backends` annotations in failing GCC backend ui tests

Follow-up of https://github.com/rust-lang/rust/pull/144125.

In the GCC backend, we don't support all ui tests yet and we have a list of tests we currently ignore available [here](https://github.com/rust-lang/rustc_codegen_gcc/blob/master/tests/failing-ui-tests.txt).

This PR adds the `ignore-backends` annotations to the corresponding ui tests.

The second commit is a fix to compiletest, complaining about `ignore-backends`.

r? ```@jieyouxu```
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