[libtooling] Add flag '-Xpreprocessor -detailed-preprocessing-record' by default in tests
[libtooling] Add flag '-Xpreprocessor -detailed-preprocessing-record' by default in tests

Summary:
[libtooling] Add flag '-Xpreprocessor -detailed-preprocessing-record' by default in tests

This flag enables certain APIs related to preprocessing.

Test Plan: make -C libtooling test

Reviewers: irp, mehdi, mbolin

Reviewed By: mbolin

Differential Revision: https://phabricator.fb.com/D1448771

raphaelamorim/facebook-clang-plugins,caijinyan/facebook-clang-plugins,CJstar/facebook-clang-plugins,caijinyan/facebook-clang-plugins,caijinyan/facebook-clang-plugins,raphaelamorim/facebook-clang-plugins,wangwei1237/facebook-clang-plugins,CJstar/facebook-clang-plugins,CJstar/facebook-clang-plugins,raphaelamorim/facebook-clang-plugins,CJstar/facebook-clang-plugins,wangwei1237/facebook-clang-plugins,wangwei1237/facebook-clang-plugins,caijinyan/facebook-clang-plugins,wangwei1237/facebook-clang-plugins,raphaelamorim/facebook-clang-plugins