Add --vg-arg option to clang test runner.
 - Passes additional argument through to valgrind.

Also, don't run valgrind with --leak-check=no by default.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@80981 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed