[Driver] Mark -arch as TargetSpecific (#74365)

`-arch` is a Darwin-specific option that is ignored for other targets
and not known by GCC.
```
% clang -arch arm64 -c a.c
clang: warning: argument unused during compilation: '-arch arm64' [-Wunused-command-line-argument]
```

We are utilizing TargetSpecific (from https://reviews.llvm.org/D151590)
to make more options lead to errors for unsupported targets.