[libc] Implement the RPC client / server for NVPTX

This patch adds the necessary code to impelement the existing RPC client
/ server interface when targeting NVPTX GPUs. This follows closely to
the implementation in the AMDGPU version. This does not yet enable unit
testing as the `nvlink` linker does not support static libraries. So
that will need to be worked around.

I am ignoring the RPC duplication between the AMDGPU and NVPTX loaders. This
will be changed completely later so there's no point unifying the code at this
stage. The implementation was tested manually with the following file and
compilation flags.

```
namespace __llvm_libc {
void write_to_stderr(const char *msg);
void quick_exit(int);
} // namespace __llvm_libc

using namespace __llvm_libc;

int main(int argc, char **argv, char **envp) {
  for (int i = 0; i < argc; ++i) {
    write_to_stderr(argv[i]);
    write_to_stderr("\n");
  }
  quick_exit(255);
}
```

```
$ clang++ crt1.o rpc_client.o quick_exit.o io.o main.cpp --target=nvptx64-nvidia-cuda -march=sm_70 -o image
$ ./nvptx_loader image 1 2 3
image
1
2
3
$ echo $?
255
```

Depends on D146681

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D146846