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[DirectX] Add test Support typedBufferLoad and Store for RWBuffer<int64_t2>, RWBuffer<uint64_t2> #275

@spall

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@spall

HLSL's Buffer/RWBuffer can operate on a vector of two 64 bit integers, like so: https://hlsl.godbolt.org/z/Mevonvav8

The typedBufferLoad and Store dxil intrinsics (introduced in llvm/llvm-project#104252 and llvm/llvm-project#104253) should be taught to handle a vector of 2 64 bit integers.

Support needs to be added for int64_t and uint64_t as well.

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