[llvm] [HLSL] Add support to lookup a ResourceBindingInfo from its use (PR #126556)

[Justin Bogner via llvm-commits]

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@@ -770,6 +770,50 @@ void DXILBindingMap::print(raw_ostream &OS, DXILResourceTypeMap &DRTM,
   }
 }
 
+SmallVector<dxil::ResourceBindingInfo>
+DXILBindingMap::findByUse(const Value *Key) const {
+  const PHINode *Phi = dyn_cast<PHINode>(Key);
+  if (Phi) {
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bogner wrote:

Best to limit the scope by declaring `Phi` in the `if()` here
```suggestion
  if (const PHINode *Phi = dyn_cast<PHINode>(Key)) {
```

https://github.com/llvm/llvm-project/pull/126556