Fix rustc test suite #2931

Job	Run time
bench	13m 40s
dist (ubuntu-20.04, x86_64-unknown-linux-gnu)	4m 11s
rustfmt	18s
dist (macos-latest, x86_64-apple-darwin)	6m 30s
dist (ubuntu-latest, x86_64-pc-windows-gnu)	5m 3s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	10m 54s
test_llvm	6m 12s
dist (windows-latest, x86_64-pc-windows-msvc)	8m 46s
test (macos-latest, x86_64-apple-darwin)	18m 18s
dist (windows-latest, x86_64-pc-windows-gnu)	7m 37s
test (ubuntu-latest, x86_64-pc-windows-gnu)	15m 21s
test (ubuntu-latest, aarch64-unknown-linux-gnu)	10m 39s
test (ubuntu-latest, s390x-unknown-linux-gnu)	6m 53s
test (windows-latest, x86_64-pc-windows-msvc)	19m 8s
test (windows-latest, x86_64-pc-windows-gnu)	23m 36s
release	19s
	2h 37m 25s

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