No PCH and rootmap for modules (#543)
No PCH and rootmap for modules (#543)

* Don't load the PCH when we have modules enabled.

The modules are supposed to provide the same functionality, so for
now we don't want the PCH when testing modules.

* Disable loading of the rootmap files when running modules.

The replacement feature for this is currently not implemented, but
we don't want the forward declarations to mix with the declaration
loading logic from the modules.

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