[kitsune] kit-config can query enabled frontends #60
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In principle, not all frontends may be enabled in any given build. For instance, even after support for lowering Fortran' DO CONCURRENT loops to Tapir instructions is added, flang may still not be enabled. In this case, we want to be able to use kit-config to query whether the frontend has been built. The primary use for this is in the kitsune-test-suite which can then automatically enable/disable certain tests.
While implementing this, some code was also cleaned up.