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Add missing documentation for running tests with GCC backend

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`1`	`1`	`# GCC codegen backend tests`
`2`	`2`
`3`		`-TODO: please add some more information to this page.`
	`3`	+To test the GCC codegen backend, you need to add `"gcc"` into the `rust.codegen-backends`
	`4`	+setting in `bootstrap.toml`:
	`5`	`+`
	`6`	+```toml
	`7`	`+rust.codegen-backends = ["llvm", "gcc"]`
	`8`	+```
	`9`	`+`
	`10`	+If you don't want to build `gcc` yourself, you also need to set:
	`11`	`+`
	`12`	+```toml
	`13`	`+gcc.download-ci-gcc = true`
	`14`	+```
	`15`	`+`
	`16`	+Then when running tests, add the `--test-codegen-backend gcc` option. For example:
	`17`	`+`
	`18`	+```bash
	`19`	`+./x.py test tests/ui --test-codegen-backend gcc`
	`20`	+```

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