[llvm] [AMDGPU] Add a trap lowering workaround for gfx11 (PR #85854)

[Emma Pilkington via llvm-commits]

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@@ -303,6 +303,12 @@ def FeatureMSAALoadDstSelBug : SubtargetFeature<"msaa-load-dst-sel-bug",
   "MSAA loads not honoring dst_sel bug"
 >;
 
+def FeaturePrivEnabledBug : SubtargetFeature<"priv-enabled-bug",
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epilk wrote:

I renamed it `FeaturePrivEnabledTrap2NopBug` in the update. WDYT? 

Incidentally, I noticed that FeatureMADIntraFwdBug isn't included in the gfx11-generic FeatureSet. Should that be updated too?

https://github.com/llvm/llvm-project/pull/85854