We currently have two info tables for a constructor

• XXX_con_info: the info table for a heap-resident instance of the constructor, It has type CONSTR, or one of the specialised types like CONSTR_1_0

• XXX_static_info: the info table for a static instance of this constructor, which has type CONSTR_STATIC or CONSTR_STATIC_NOCAF.

I'm getting rid of the latter, and using the con_info info table for
both static and dynamic constructors. For rationale and more details
see Note [static constructors] in SMRep.hs.

I also removed these macros: isSTATIC(), ip_STATIC(),
closure_STATIC(), since they relied on the CONSTR/CONSTR_STATIC
distinction, and anyway HEAP_ALLOCED() does the same job.

validate