Auto merge of #52360 - Mark-Simulacrum:fix-keep-stage-for-cg-backends, r=alexcrichton

Do not attempt to recompile codegen backend(s) with --keep-stage

Previously we'd attempt to recompile them and that would fail since
we've essentially not built the entire compiler yet, or we're faking
that fact. This commit should make us ignore the codegen backend build
as well.

Unlike the other compile steps, there is no CodegenBackendLink step that
we run here, because that is done later as a part of assembling the
final compiler and as an explicit function call.

r? @alexcrichton

I think this may fix or at least assist with #52174.

cc @RalfJung @tinco -- if you can test this patch locally that'd be
amazing; I don't want to recompile for the next couple hours to test it
locally. I don't think it can make the situation worse, and in fact, if
I've interpreted the cause of the failure correctly then this will fix
your problem.

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