Add to gfx11.

RDNA 3 manual says "Floating-point addition handles NAN/INF/denorm"
thought I'm not sure I trust it.

Author: arsenm

llvm/lib/Target/AMDGPU/AMDGPU.td

@@ -1547,7 +1547,8 @@ def FeatureISAVersion11_Common : FeatureSet<
    FeatureFlatAtomicFaddF32Inst,
    FeatureImageInsts,
    FeaturePackedTID,
-   FeatureVcmpxPermlaneHazard]>;
+   FeatureVcmpxPermlaneHazard,
+   FeatureMemoryAtomicFaddF32DenormalSupport]>;
 
 // There are few workarounds that need to be
 // added to all targets. This pessimizes codegen