Auto merge of #148314 - matthiaskrgr:rollup-yo55adr, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - rust-lang/rust#144291 (Constify trait aliases)
 - rust-lang/rust#147633 (Add new `--bypass-ignore-backends` option)
 - rust-lang/rust#148252 (Improve diagnose for unconditional panic when resource limit)
 - rust-lang/rust#148262 (Fix types being marked as dead when they are inferred generic arguments)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

src/tests/directives.md

@@ -207,7 +207,9 @@ settings:
   on `wasm32-unknown-unknown` target because the target does not support the
   `proc-macro` crate type.
 - `needs-target-std` — ignores if target platform does not have std support.
-- `ignore-backends` — ignores the listed backends, separated by whitespace characters.
+- `ignore-backends` — ignores the listed backends, separated by whitespace characters. Please note
+  that this directive can be overriden with the `--bypass-ignore-backends=[BACKEND]` command line
+  flag. 
 - `needs-backends` — only runs the test if current codegen backend is listed.
 
 The following directives will check LLVM support: