intrinsics: unify rint, roundeven, nearbyint in a single round_ties_even intrinsic#136543
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LLVM has three intrinsics here that all do the same thing (when used in the default FP environment). There's no reason Rust needs to copy that historically-grown mess -- let's just have one intrinsic and leave it up to the LLVM backend to decide how to lower that.
Suggested by @hanna-kruppe in #136459; Cc @tgross35
try-job: test-various