[clang] [HLSL] Make it possible to assign an array from a cbuffer (PR #134174)

[Finn Plummer via cfe-commits]

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@@ -2268,17 +2268,15 @@ static bool IsStandardConversion(Sema &S, Expr* From, QualType ToType,
     // handling here.
     if (ToType->isArrayParameterType()) {
       FromType = S.Context.getArrayParameterType(FromType);
-      SCS.First = ICK_HLSL_Array_RValue;
     } else if (FromType->isArrayParameterType()) {
       const ArrayParameterType *APT = cast<ArrayParameterType>(FromType);
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inbelic wrote:

nit:
```suggestion
    } else if (const ArrayParameterType *APT = dyn_cast<ArrayParameterType>(FromType)) {
```
I think this is equivalent? The function seems to just be a wrapper to the `isa<..>` equivalent

https://github.com/llvm/llvm-project/pull/134174