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069e8bcd82
Summary: Currently there are several layers to handle `printf`. Since we now have varargs and an implementation of `printf` this can be heavily simplified. 1. The frontend renames `printf` into `omp_vprintf` and gives it an argument buffer. Removing 1. triggered some code in the AMDGPU backend menat for HIP / OpenCL, so I hadded an exception to it. 2. Forward this to CUDA vprintf or ignore it. We no longer need special handling for it since we have varargs. So now we just forward this to CUDA vprintf if we have libc, otherwise just leave `printf` as an external function and expect that `libc` will be linked in.