[Driver] Use shared singleton instance of DriverOptTable
Summary:
This significantly reduces the time required to run clangd tests, by
~10%.
Should also have an effect on other tests that run command-line parsing
multiple times inside a single invocation.
Reviewers: gribozavr, sammccall
Reviewed By: sammccall
Subscribers: kadircet, cfe-commits
Tags: #clang
Differential Revision: https://reviews.llvm.org/D67163
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@370908
91177308-0d34-0410-b5e6-
96231b3b80d8
projects / clang / commit