[llvm] [AMDGPU] Use correct VGPR threshold for flagging ExcessRP regions in unified register file case (PR #85860)

[Jeffrey Byrnes via llvm-commits]

================
@@ -974,11 +974,13 @@ void GCNSchedStage::checkScheduling() {
                       << DAG.MinOccupancy << ".\n");
   }
 
-  unsigned MaxVGPRs = ST.getMaxNumVGPRs(MF);
+  unsigned MaxVGPRs = ST.getMaxNumVGPRs(MF, /*WholeRegisterFile*/ true);
+  unsigned MaxArchVGPRs = ST.getMaxNumVGPRs(MF, /*WholeRegisterFile*/ false);
----------------
jrbyrnes wrote:

This is correct, but I think other users of `getMaxNumVGPRs` may want to do the same thing

https://github.com/llvm/llvm-project/pull/85860