Always use the pure Rust fallback instead of `llvm.{maximum,minimum}`
While https://github.com/llvm/llvm-project/pull/142170 was merged, it was reverted and next attempt (https://github.com/llvm/llvm-project/pull/140193) at fixing the LLVM implementation seems to have stall, so let's reverted back to pure Rust with the LLVM codegen.
cc [#t-compiler/llvm > `llvm.minimum`/`llvm.maximum` issues @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/187780-t-compiler.2Fllvm/topic/.60llvm.2Eminimum.60.2F.60llvm.2Emaximum.60.20issues/near/527044712)
Fixes https://github.com/rust-lang/rust/issues/141087
r? `@tgross35`
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