Use separate_arguments in CMake to pass compiler flags to tests
Use separate_arguments in CMake to pass compiler flags to tests

Previously, CMAKE_<lang>_FLAGS were each being passed to add_test as a
single string.  Now, they're treated as a list of space-separated
strings, as one would expect.

losalamos/Byfl,losalamos/Byfl,losalamos/Byfl,losalamos/Byfl