Sanitizer bot: add -gmlt to clang bootstrap flags.


git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@223358 91177308-0d34-0410-b5e6-96231b3b80d8
Sanitizer bot: add -gmlt to the stage1 compiler as well.


git-svn-id: https://llvm.org/svn/llvm-project/zorg/trunk@223361 91177308-0d34-0410-b5e6-96231b3b80d8