[llvm] Reapply [AMDGPU] Avoid resource propagation for recursion through multiple functions (PR #112251)

[Matt Arsenault via llvm-commits]

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@@ -163,23 +139,31 @@ void MCResourceInfo::assignResourceInfoExpr(
   MCSymbol *Sym = getSymbol(MF.getName(), RIK, OutContext);
   if (!Callees.empty()) {
     SmallVector<const MCExpr *, 8> ArgExprs;
-    // Avoid recursive symbol assignment.
     SmallPtrSet<const Function *, 8> Seen;
     ArgExprs.push_back(LocalConstExpr);
-    const Function &F = MF.getFunction();
-    Seen.insert(&F);
 
     for (const Function *Callee : Callees) {
       if (!Seen.insert(Callee).second)
         continue;
+
+      SmallPtrSet<const MCExpr *, 8> WorkSet;
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arsenm wrote:

I expect to maintain the set for all callees to be visited, not redone on each one 

https://github.com/llvm/llvm-project/pull/112251