versioner: Use llvm::opt::ArgStringList

This commit replaces `clang::driver::ArgStringList` with
`llvm::opt::ArgStringList` because starting from r344398, the alias for
`llvm::opt::ArgStringList` has been removed from the `clang::driver`
namespace.

Note: This is a step to port clang tools to clang-r346389.

See also. https://reviews.llvm.org/rL344398

Bug: 119558057
Test: cd bionic/tools/versioner; mma; ./run_tests.py
Change-Id: I9b5ff572a9af6c6ffaf2c4c9cb01c97f4b85ac22