28bc5a2f7f
Match std `RUSTFLAGS` for host and target for `mir-opt` test suite to fix double std build/rebuilds
Previously the bootstrap compiletest `Step::run` flow had:
```rs
// ensure that `libproc_macro` is available on the host.
builder.ensure(compile::Std::new(compiler, compiler.host));
// ...
if suite == "mir-opt" {
builder.ensure(compile::Std::new_for_mir_opt_tests(compiler, target));
} else {
builder.ensure(compile::Std::new(compiler, target));
}
```
This can cause unnecessary std rebuilds (even on the same invocation) because if host == target then `builder.ensure(compile::Std::new_for_mir_opt_tests(compiler, target))` will have different `RUSTFLAGS` than `builder.ensure(compile::Std::new(compiler, compiler.host))`.
This PR fixes that by matching up std `RUSTFLAGS` if the test suite is `mir-opt`:
```rs
if suite == "mir-opt" {
builder.ensure(compile::Std::new_for_mir_opt_tests(compiler, compiler.host));
} else {
builder.ensure(compile::Std::new(compiler, compiler.host));
}
```
This is a short-term fix, the better fix is to enforce how `RUSTFLAGS` are handled as described in https://github.com/rust-lang/rust/issues/131437#issuecomment-2401710727.
Fixes #131437.
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