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

[Ashley Coleman 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 {
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V-FEXrt wrote:

reading that it seems a bit different to me because disjoint definitions can resolve to the same resource.

Ex:

In the below, `findX(%a)` and `findX(%z)` resolve to the same binding info because the create parameters are identical  and therefore the underlying resource is the same even those they were both defined in different locations

 ```
%a = create 1,2,3
%b  = %a
%c = %b
%x = create 1,2,3
%y = %x
%z = y
```

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