Register llvm_shutdown using on_proc_exit, not before_shmem_exit.

This seems more correct, because other before_shmem_exit calls may
expect the infrastructure that is needed to run queries and access the
database to be working, and also because this cleanup has nothing to
do with shared memory.

This is a back-patch of bab150045b.

There were no known user-visible consequences to this, though, apart
from what was previous fixed by commit 303640199d and back-patched
as commit bcbc27251d and commit f7013683d9, so bab150045b was
not no back-patched at the time.

Bharath Rupireddy

Discussion: http://postgr.es/m/CALj2ACWk7j4F2v2fxxYfrroOF=AdFNPr1WsV+AGtHAFQOqm_pw@mail.gmail.com
Backpatch-through: 13, 12

src/backend/jit/llvm/llvmjit.c

@@ -925,7 +925,7 @@ llvm_session_initialize(void)
 	}
 #endif							/* LLVM_VERSION_MAJOR > 11 */
 
-	before_shmem_exit(llvm_shutdown, 0);
+	on_proc_exit(llvm_shutdown, 0);
 
 	llvm_session_initialized = true;