Fix a bug that causes dotest.py to exit with a passing exit-code, even if some tests fail
- occurs when multiple compilers/architectures are tested (via -C or -A flags)




git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@175656 91177308-0d34-0410-b5e6-96231b3b80d8