[llvm] [AMDGPU] Change handling of unsupported non-compute shaders with HSA (PR #126798)

[Matt Arsenault via llvm-commits]

================
@@ -2933,7 +2937,7 @@ SDValue SITargetLowering::LowerFormalArguments(
 
   for (unsigned i = 0, e = Ins.size(), ArgIdx = 0; i != e; ++i) {
     const ISD::InputArg &Arg = Ins[i];
-    if (Arg.isOrigArg() && Skipped[Arg.getOrigArgIndex()]) {
+    if ((Arg.isOrigArg() && Skipped[Arg.getOrigArgIndex()]) || IsUnsupportedHsa) {
----------------
arsenm wrote:

If you want to keep this as it is with the separated handling down here, I'd go with a broader IsError or something.
However, I think it would be cleaner to just have a separate loop populating InVals in the error case with the undefs 



https://github.com/llvm/llvm-project/pull/126798