Use installed llvm-lit.py instead of lit.py PR-51072

Three tests fail when building and testing LLVM from the Visual C++ environment
since they use the repo version of lit.py that do not have local customization
builtin_parameters = { 'build_mode' : 'Release' }
https://bugs.llvm.org/show_bug.cgi?id=51072

Reviewed By: dyung

Differential Revision: https://reviews.llvm.org/D108085