jit: Reference function pointer types via llvmjit_types.c.

Andres Freund <andres@anarazel.de>

Commit: df99ddc70b971a991c5111a33f2f08bd7945d5c2
Author: Andres Freund <andres@anarazel.de>
Date: 2020-12-09T00:55:20Z
Releases: 14.0
jit: Reference function pointer types via llvmjit_types.c.

It is error prone (see 5da871bfa1b) and verbose to manually create function
types. Add a helper that can reference a function pointer type via
llvmjit_types.c and and convert existing instances of manual creation.

Author: Andres Freund <andres@anarazel.de>
Reviewed-By: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/20201207212142.wz5tnbk2jsaqzogb@alap3.anarazel.de

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