[LLVM->SPIRV] Translate AddrSpaceCast from generic null to OpGenericCastToPtr
#3411
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…cCastToPtr Some GPU backends materialize non-generic nulls via addrspacecast from generic null, see https://github.com/llvm/llvm-project/blob/14ed67411ce1/clang/lib/CodeGen/Targets/SPIR.cpp#L257 llvm-spirv should preserve the addrspacecast.
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Some GPU backends materialize non-generic nulls via addrspacecast from generic null, see https://github.com/llvm/llvm-project/blob/14ed67411ce1/clang/lib/CodeGen/Targets/SPIR.cpp#L257
llvm-spirv should preserve the addrspacecast.