[llvm] [ARM] Remove `UnsafeFPMath` uses (PR #151275)

[David Green via llvm-commits]

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@@ -222,8 +222,7 @@ void ARMSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
   // NEON f32 ops are non-IEEE 754 compliant. Darwin is ok with it by default.
   const FeatureBitset &Bits = getFeatureBits();
   if ((Bits[ARM::ProcA5] || Bits[ARM::ProcA8]) && // Where this matters
-      (Options.UnsafeFPMath || isTargetDarwin() ||
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davemgreen wrote:

Oh I had meant for these to be part of the other patches - the point was to make this just handle the build attributes (the bit I am less sure about). I missed that in the other patches, I obviously didn't read them carefully enough.  The point is to take this patch that does 3 different things are turn it into 3 patches that do 1.

https://github.com/llvm/llvm-project/pull/151275