[llvm] [InstCombine] Fold fptoui (fdiv (uitofp X), C) to udiv X, C (PR #205853)

[Sungbin Jo via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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goranmoomin wrote:

i added the test case `vec_i16_float_neg_divisor` in addition to the `vec_i32_double_const` / `si32_double_vec` case that originally existed in the latest commit.

https://github.com/llvm/llvm-project/pull/205853