[Nightly CI] Integration tests jobs taking >1hr to compile
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@mikeurbach is already working on this.
Since Aug 17, 2021.
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Description
Example: https://github.com/llvm/circt/runs/3344394208?check_suite_focus=true
Seems like ccache isn't hitting so the unified builds are re-compiling MLIR:

@mikeurbach Can you take a look? Could be the other configurations are causing cache conflicts? Perhaps it's downloading the wrong ccache?
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