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Rollup merge of #137667 - Kobzol:gcc-dist-build, r=onur-ozkan

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Add `dist::Gcc` build step

This PR adds a `dist:Gcc` bootstrap step to distribute a prebuilt `libgccjit.so` from CI on x64 Linux.

With primed sccache, the build takes ~4 minutes on CI, and produces a 50 MiB archive.

I want to land this before adding something akin to `[gcc] download-ci-gcc = true`, to already have the artifacts available on CI, to make it easier to setup the download merge-base logic.

r? ``@ghost``
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Jubilee 2025-03-04 14:50:41 -08:00 • committed by GitHub
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src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile
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@ -101,7 +101,7 @@ ENV SCRIPT python3 ../x.py build --set rust.debug=true opt-dist && \
./build/$HOSTS/stage0-tools-bin/opt-dist linux-ci -- python3 ../x.py dist \
--host $HOSTS --target $HOSTS \
--include-default-paths \
build-manifest bootstrap
build-manifest bootstrap gcc
ENV CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=clang
# This is the only builder which will create source tarballs