[llvm] [AMDGPU] Remove `UnsafeFPMath` (PR #151079)

[Matt Arsenault via llvm-commits]

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@@ -3076,7 +3076,7 @@ define float @v_log_f32_fast(float %in) {
   ret float %result
 }
 
-define float @v_log_f32_unsafe_math_attr(float %in) "unsafe-fp-math"="true" {
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arsenm wrote:

I believe this file already has test for the flag, this test function is specifically to test the attributes so it can be deleted (same applies for most of these files) 

https://github.com/llvm/llvm-project/pull/151079