[llvm] [MCP] Avoid Folding Spill Chains Over Across Source Clobbers (PR #207169)

[Matt Arsenault via llvm-commits]

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@@ -1376,6 +1379,27 @@ void MachineCopyPropagation::eliminateSpillageCopies(MachineBasicBlock &MBB) {
           }
         };
 
+        auto HasUnexpectedCopySourceDef = [&](const MachineInstr *Copy,
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arsenm wrote:

Can you do a deeper refactoring? We now have lambdas nested inside other lambdas 

https://github.com/llvm/llvm-project/pull/207169