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

[Matt Arsenault via llvm-commits]

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@@ -443,6 +444,13 @@ class GCNSubtarget final : public AMDGPUGenSubtargetInfo,
     return isAmdHsaOS() ? TrapHandlerAbi::AMDHSA : TrapHandlerAbi::NONE;
   }
 
+  // True on hardware where 's_trap 2' is treated as a nop that must be
+  // simulated.
+  bool requiresSimulatedTrap() const {
+    AMDGPU::IsaVersion V = AMDGPU::getIsaVersion(getCPU());
+    return V.Major == 11 && V.Minor <= 3;
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arsenm wrote:

We shouldn't have to parse the target-cpu name in any query. Just define a proper feature for this?

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