[DXIL][Analysis] Uniquify duplicate resources in DXILResourceAnalysis

If a resources is used multiple times, we should only have one resource record
for it. This comes up most prominantly with arrays of resources like so:

```hlsl
RWBuffer<float4> BufferArray[10] : register(u0, space4);
RWBuffer<float4> B1 = BufferArray[0];
RWBuffer<float4> B2 = BufferArray[SomeIndex];
RWBuffer<float4> B3 = BufferArray[3];
```

In this case, there's only one resource, but we'll generate 3 different
`dx.handle.fromBinding` calls to access different slices.

Note that this adds some API that won't be used until #104447 later in the
stack. Trying to avoid that results in unnecessary churn.

Fixes #105143

Pull Request: https://github.com/llvm/llvm-project/pull/105602

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