lit.TestFormats.GoogleTest: Honor LitConfig.noExecute, or --no-execute were ignored.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176930 91177308-0d34-0410-b5e6-96231b3b80d8
Set symbolizer path in the test environment.

This is needed to get symbolized stack traces when running LLVM tests under (A|M)San.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176933 91177308-0d34-0410-b5e6-96231b3b80d8