Jana Dönszelmann da42289cd7
Rollup merge of #142976 - compiler-errors:coerce-ice, r=fee1-dead
Check CoerceUnsized impl validity before coercing

Self-explanatory from the title.

Fixes rust-lang/rust#126982
Fixes rust-lang/rust#131048
Fixes rust-lang/rust#134217
Fixes rust-lang/rust#126269
Fixes rust-lang/rust#138265
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This is serves as a collection of crashes so that accidental ICE fixes are tracked. This was formally done at https://github.com/rust-lang/glacier but doing it inside the rustc testsuite is more convenient.

It is imperative that a test in the suite causes an internal compiler error/panic or makes rustc crash in some other way. A test will "pass" if rustc exits with something other than 1 or 0.

When adding crashes from https://github.com/rust-lang/rust/issues, the issue number should be noted in the file name (12345.rs should suffice) and also inside the file via //@ known-bug #4321 if possible.

If you happen to fix one of the crashes, please move it to a fitting subdirectory in tests/ui and give it a meaningful name. Also please add a doc comment at the top of the file explaining why this test exists. :) Adding Fixes #NNNNN Fixes #MMMMM to the description of your pull request will ensure the corresponding tickets will be closed automatically upon merge. The ticket ids can be found in the file name or the known-bug annotation inside the testfile.

Please do not re-report any crashes that you find here!