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With -fobject-code it now can do.

Now, if a single module *anywhere* on the module tree is built with
-fhpc, the binary will enable reading/writing of <bin>.tix.

Previously, you needed to compile Main to allow coverage to operate.

This changes the file format for .hi files; you will need to recompile every library.

This makes the code slightly simpler but only works because we do not support
rank-n types.

This tracks the corresponding change in package ndp. With this patch, we
finally can vectorise something (f x = x).