Rollup merge of #81955 - dtolnay:dwp, r=Mark-Simulacrum
bootstrap: Locate llvm-dwp based on llvm-config bindir
Fixes #81949.
Tested by successfully building 1.50.0 pre-release, which is where I originally hit the issue (https://internals.rust-lang.org/t/rust-1-50-0-pre-release-testing/14012/4?u=dtolnay). Tested both with and without prebuilt LLVM. The check for dry_run is necessary in the non-prebuilt case because the llvm-config built by bootstrap won't exist yet.
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