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Rollup merge of #95927 - Kobzol:ci-pgo-libcore, r=lqd

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CI: do not compile libcore twice when performing LLVM PGO

I forgot the delete the first compilation when modifying this file in a previous PR.

r? ```@lqd```
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Dylan DPC 2022-04-11 20:00:46 +02:00 • committed by GitHub
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src/ci/pgo.sh
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@ -47,12 +47,6 @@ python3 ../x.py build --target=$PGO_HOST --host=$PGO_HOST \
--stage 2 library/std \
--llvm-profile-generate
# Profile libcore compilation in opt-level=0 and opt-level=3
RUSTC_BOOTSTRAP=1 ./build/$PGO_HOST/stage2/bin/rustc \
--edition=2021 --crate-type=lib ../library/core/src/lib.rs
RUSTC_BOOTSTRAP=1 ./build/$PGO_HOST/stage2/bin/rustc \
--edition=2021 --crate-type=lib -Copt-level=3 ../library/core/src/lib.rs
# Compile rustc perf
cp -r /tmp/rustc-perf ./
chown -R $(whoami): ./rustc-perf