Revert #129749 to fix segfault in LLVM This reverts commit 8c7a7e346b, reversing changes made to a00bd75b6c. Reported in https://github.com/rust-lang/rust/pull/129749#issuecomment-2354417960. `@nikic's` theory is that the LLVM API changed in a way that makes it impossible to use concurrently from multiple threads (https://github.com/llvm/llvm-project/pull/106427#issuecomment-2354783802). I pinged `@krasimirgg` who was fine with reverting. r? `@rust-lang/wg-llvm`
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