[llvm] [AMDGPU] Support preloading hidden kernel arguments (PR #98861)

[Austin Kerbow via llvm-commits]

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@@ -2534,6 +2535,20 @@ void SITargetLowering::allocatePreloadKernArgSGPRs(
       unsigned NumAllocSGPRs =
           alignTo(ArgLoc.getLocVT().getFixedSizeInBits(), 32) / 32;
 
+      // Add padding SPGR to fix alignment for hidden arguments.
+      if (!AlignedForImplictArgs && Arg.hasAttribute("amdgpu-work-group-id")) {
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kerbowa wrote:

Thanks for catching this, it must have become dead at some point in the review process and the tests autoupdated without noticing.

https://github.com/llvm/llvm-project/pull/98861