[llvm] [AMDGPU] Flush denormal results when constant folding amdgcn.rcp (PR #203566)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
index 3e71ec99a..4751d4614 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
@@ -1141,7 +1141,8 @@ GCNTTIImpl::instCombineIntrinsic(InstCombiner &IC, IntrinsicInst &II) const {
         else if (Mode.Output == DenormalMode::PositiveZero)
           Val = APFloat::getZero(Sem, /*Negative=*/false);
         else if (Mode.Output != DenormalMode::IEEE)
-          break; // Dynamic: hardware behavior is unknown, leave the call in place.
+          break; // Dynamic: hardware behavior is unknown, leave the call in
+                 // place.
       }
 
       return IC.replaceInstUsesWith(II, ConstantFP::get(II.getContext(), Val));

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https://github.com/llvm/llvm-project/pull/203566