[CIR][CUDA] Support device-side printf for NVPTX (#196573) Implement device-side printf lowering for NVPTX targets in CIR codegen. The variadic arguments are packed into a stack-allocated struct and passed to vprintf, matching the classic codegen behavior in CGGPUBuiltin.cpp When the target triple is NVPTX and the builtin is printf/__builtin_printf, we route to emitNVPTXDevicePrintfCallExpr The no-varargs case passes a null pointer directly. AMDGCN device printf remains NYI. part of https://github.com/llvm/llvm-project/issues/179278
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