[llvm] [AMDGPU] Update code object metadata for kernarg preload (PR #134666)

[Matt Arsenault via llvm-commits]

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@@ -745,5 +768,182 @@ void MetadataStreamerMsgPackV6::emitVersion() {
   getRootMetadata("amdhsa.version") = Version;
 }
 
+void MetadataStreamerMsgPackV6::emitHiddenKernelArgWithPreload(
+    const DataLayout &DL, Type *ArgTy, Align Alignment,
+    KernArgPreload::HiddenArg HiddenArg, StringRef ArgName, unsigned &Offset,
+    msgpack::ArrayDocNode Args, const AMDGPUFunctionArgInfo &ArgInfo) {
+
+  SmallString<16> PreloadStr;
+  const auto *PreloadDesc = ArgInfo.getHiddenArgPreloadDescriptor(HiddenArg);
+  if (PreloadDesc) {
+    const auto &Regs = PreloadDesc->Regs;
+    for (unsigned I = 0; I < Regs.size(); ++I) {
+      if (I > 0)
+        PreloadStr += " ";
+      PreloadStr += AMDGPUInstPrinter::getRegisterName(Regs[I]);
+    }
+  }
+  emitKernelArgImpl(DL, ArgTy, Alignment, ArgName, Offset, Args, PreloadStr);
+}
+
+void MetadataStreamerMsgPackV6::emitHiddenKernelArgs(
+    const MachineFunction &MF, unsigned &Offset, msgpack::ArrayDocNode Args) {
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arsenm wrote:

I don't see why this needs to duplicate most of the code from the V5 version, the offsets didn't change 

https://github.com/llvm/llvm-project/pull/134666