[llvm] [AMDGPU][SplitModule] Handle !callees metadata (PR #108802)

[Matt Arsenault via llvm-commits]

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@@ -562,6 +564,9 @@ void SplitGraph::buildGraph(CallGraph &CG) {
 
         if (handleCalleesMD(Inst, KnownCallees))
           continue;
+        // If we failed to parse any !callees MD, or some was missing,
+        // the entire KnownCallees list is now unreliable.
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arsenm wrote:

Sounds like the verifier is missing validation on callees entries? You shouldn't really have to worry about parsing it

https://github.com/llvm/llvm-project/pull/108802