Back-patch LLVM 14 API changes.

Thomas Munro <tmunro@postgresql.org>

Commit: 986d24042bb96aba1a486e78c2c0517e4b0ad65b
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2022-03-15T22:35:00Z
Releases: 11.16
Back-patch LLVM 14 API changes.

Since LLVM 14 has stopped changing and is about to be released,
back-patch the following changes from the master branch:

  e6a7600202105919bffd62b3dfd941f4a94e082b
  807fee1a39de6bb8184082012e643951abb9ad1d
  a56e7b66010f330782243de9e25ac2a6596be0e1

Back-patch to 11, where LLVM JIT support came in.

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