Auto merge of #93577 - nikic:llvm-14, r=nagisa

Upgrade to LLVM 14

LLVM patch state:
 * [x] https://github.com/llvm/llvm-project/commit/a55727f334b39600bfc71144b11b42aae6b94e0b Backported.
 * [x] https://github.com/rust-lang/llvm-project/commit/c3c82dc12402dd41441180c0c6cf7aed7e330c53 Backported as https://github.com/llvm/llvm-project/commit/917c47b3bf0dfc45a2a5ba12c1397d647ecf4017.
 * [x] https://github.com/rust-lang/llvm-project/commit/6e8f9ab632d12271355d10d34c9835a7ba14e4b9 No plan to upstream.
 * [x] https://github.com/llvm/llvm-project/commit/319f4b2d52e31b000db75a0a2484b5f2ab90534a Backported.
 * [x] https://github.com/rust-lang/llvm-project/commit/8b2c25d321f877161f85218479e2d1317d770e18 No plan to upstream.
 * [x] https://github.com/rust-lang/llvm-project/commit/75fef2efd427362c8f16b2d09e6ebf44069e3919 No plan to upstream.
 * [ ] https://github.com/rust-lang/llvm-project/commit/adef757547de5a570d9f6a00d3e6ac16c666ab79 Upstreamed as https://github.com/llvm/llvm-project/commit/2d2ef384b2f6e723edb793d08f52e7f4dc94ba3a. Needs backport.
 * [x] https://github.com/rust-lang/llvm-project/commit/4b7c1b4910e9fa9e04f23f06be078e168ef4c0ee No plan to upstream.
 * [x] https://github.com/rust-lang/llvm-project/commit/3f5ab0c061adb723f25b94243828b6b5407720c8 No plan to upstream.
 * [x] https://github.com/rust-lang/llvm-project/commit/514d05500e0e15e358f05f5c4cec78a805858f8e No plan to upstream.
 * [ ] https://github.com/rust-lang/llvm-project/commit/54c586958564582b3341d1838a5de86541e5fecf Under review at https://reviews.llvm.org/D119695 and https://reviews.llvm.org/D119856.

Release timeline:
 * LLVM 14.0.0 final planned for Mar 15.
 * Rust 1.60.0 planned for Apr 7.

Compile-time:
  * https://perf.rust-lang.org/compare.html?start=250384edc5d78533e993f38c60d64e42b21684b2&end=b87df8d2c7c5d9ac448c585de10927ab2ee1b864
  * A slight improvement on average, though no big changes either way.
  * There are some larger max-rss improvements.

r? `@ghost`

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