Playing around with proposed C++ reflection.
There's no guarantee that these will continue to build as the compiler
continues to advance but by running prepare.sh with the environment
variable GUARANTEE_BUILD set to a non-zero value, a known safe commit will
be used when building Clang.
Otherwise the latest commit on the branch p2996 will be used.
Prerequisite programs for building are Ninja and CMake.
Run ./prepare to build the p2996 Clang branch and run CMake for the project.
Build the project with cmake --build build.
To run an executable use ./run_executable <executable_name>, e.g.,
./run_executable commands.