[llvm] [AMDGPU] Update patterns for v_cvt_flr and v_cvt_rpi (PR #177962)

[Mirko Brkušanin via llvm-commits]

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@@ -758,8 +758,11 @@ def FP_ONE : PatLeaf <
 
 def FP_HALF : PatLeaf <
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mbrkusanin wrote:

I think this code predates it.
https://github.com/llvm/llvm-project/pull/178018

https://github.com/llvm/llvm-project/pull/177962