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Auto merge of #94381 - Kobzol:llvm-bolt, r=Mark-Simulacrum
Use BOLT in CI to optimize LLVM This PR adds an optimization step in the Linux `dist` CI pipeline that uses [BOLT](https://github.com/llvm/llvm-project/tree/main/bolt) to optimize the `libLLVM.so` library built by boostrap. Steps: - [x] Use LLVM 15 as a bootstrap compiler and use it to build BOLT - [x] Compile LLVM with support for relocations (`-DCMAKE_SHARED_LINKER_FLAGS="-Wl,-q"`) - [x] Gather profile data using instrumented LLVM - [x] Apply profile to LLVM that has already been PGOfied - [x] Run with BOLT profiling on more benchmarks - [x] Decide on the order of optimization (PGO -> BOLT?) - [x] Decide how we should get `bolt` (currently we use the host `bolt`) - [x] Clean up The latest perf results can be found [here](rust-lang/rust#94381 (comment)). The current CI build time with BOLT applied is around 1h 55 minutes.
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