The non-GTest library will be shared by unittests of Flang and Flang-RT.
Promote it as a regular library for use by both projects.
In the long term, we may want to convert these to regular GTest checks
to avoid having multiple testing frameworks.
Some of the regression tests are C programs that act as test harnesses
for the compiler internals as opposed to being Fortran inputs to test
the compiler in action. The former style of tests are analog to LLVM's
unittests and will not use the lit framework.
Change-Id: I0ff10e23f66ff843e8fff4c35cfb6559b9dab762
Original-commit: flang-compiler/f18@2bfddbe8f8
Reviewed-on: https://github.com/flang-compiler/f18/pull/1027
Tree-same-pre-rewrite: false