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Auto merge of #135763 - nikic:llvm-20, r=cuviper
Update to LLVM 20
LLVM 20 GA is scheduled for March 11th. Rust 1.87 will be stable on May 15th.
* [x] https://github.com/rust-lang/rust/pull/135764
* [x] https://github.com/rust-lang/rust/pull/136134
* [x] https://github.com/rust-lang/compiler-builtins/pull/752
* [x] https://github.com/llvm/llvm-project/pull/125287
* [x] https://github.com/rust-lang/rust/pull/136537
* [x] https://github.com/rust-lang/rust/pull/136895
* [x] Wait for beta branch (Feb 14).
Tested: host-x86_64, host-aarch64, apple, mingw, msvc
