[clang] [llvm] [AMDGPU] Implement variadic functions by IR lowering (PR #93362)

[Jon Chesterfield via cfe-commits]

================
@@ -103,19 +104,27 @@ void AMDGPUABIInfo::computeInfo(CGFunctionInfo &FI) const 
{
   if (!getCXXABI().classifyReturnType(FI))
     FI.getReturnInfo() = classifyReturnType(FI.getReturnType());
 
+  unsigned ArgumentIndex = 0;
+  const unsigned numFixedArguments = FI.getNumRequiredArgs();
----------------
JonChesterfield wrote:

Added the test to this PR and also split out #94083. Can land that subpatch 
first and rebase this for a reduction in complexity.

https://github.com/llvm/llvm-project/pull/93362
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