`x.py test` ignores `--no-fail-fast` in some tool testsuites.

[jchecahi]

It looks like some tool testsuites (like clippy's or rustfmt's) will ignore the no fail fast option. For example running ./x.py test --no-fail-fast clippy will stop after compile-test fails, something common in big endian platforms.

If I understand correctly this seems to be because bootstrap is not passing --no-fail-fast to cargo test in every tool implementation. Currently, the flag is passed in the Step trait implementation of some tools (i.e. cargo), right after calling tool::prepare_tool_cargo(). But others like mentioned clippy or rustfmt are missing it.

[jchecahi]

@rustbot claim

[jyn514]

cc #104198