[llvm] [AMDGPU][True16][CodeGen] true16 codegen pat for fptrunc_round (PR #124044)

[Brox Chen via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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broxigarchen wrote:

renamed

https://github.com/llvm/llvm-project/pull/124044