[clang] [llvm] [AMDGPU] Adding the amdgpu-num-work-groups function attribute (PR #79035)

[Matt Arsenault via cfe-commits]

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@@ -494,6 +494,14 @@ MetadataStreamerMsgPackV4::getHSAKernelProps(const 
MachineFunction &MF,
 
   Kern[".max_flat_workgroup_size"] =
       Kern.getDocument()->getNode(MFI.getMaxFlatWorkGroupSize());
+  unsigned NumWGX = MFI.getMaxNumWorkGroupsX();
+  unsigned NumWGY = MFI.getMaxNumWorkGroupsY();
+  unsigned NumWGZ = MFI.getMaxNumWorkGroupsZ();
+  if (NumWGX != 0 && NumWGY != 0 && NumWGZ != 0) {
+    Kern[".max_num_work_groups_x"] = Kern.getDocument()->getNode(NumWGX);
+    Kern[".max_num_work_groups_y"] = Kern.getDocument()->getNode(NumWGY);
+    Kern[".max_num_work_groups_z"] = Kern.getDocument()->getNode(NumWGZ);
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arsenm wrote:

In other contexts it's "workgroup" not "work group". Should probably change 
this to be consistent 

https://github.com/llvm/llvm-project/pull/79035
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