[llvm] [SandboxVec][DAG] MemDGNode for memory-dependency candidate nodes (PR #109684)

[via llvm-commits]

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@@ -66,9 +84,94 @@ class DGNode {
 #endif // NDEBUG
 };
 
+/// A DependencyGraph Node for instructiosn that may read/write memory, or have
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Sterling-Augustine wrote:

instructions

https://github.com/llvm/llvm-project/pull/109684