[llvm] [AMDGPU] Fix hidden kernarg preload count inconsistency (PR #116759)

[Austin Kerbow via llvm-commits]

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@@ -748,6 +748,10 @@ GCNUserSGPRUsageInfo::GCNUserSGPRUsageInfo(const Function &F,
     FlatScratchInit = true;
   }
 
+  if (!AMDGPU::isGraphics(CC) && !IsKernel &&
+      !F.hasFnAttribute("amdgpu-no-lds-kernel-id"))
+    LDSKernelId = true;
+
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kerbowa wrote:

I've just removed the refactoring for LDSKernelID since it's not relevant for kernels, but FYI this just copied the existing logic from `SIMachineFunction.cpp`, so if it's incorrect we should update it there.

https://github.com/llvm/llvm-project/pull/116759