auto_explain: Include JIT information if applicable.

Due to my (Andres') omission auto_explain did not include information
about JIT compilation. Fix that.

Author: Lukas Fittl
Discussion:
https://postgr.es/m/CAP53PkzgSyoTCau0-5FNaM484B=uO8nLzma7L1ncWLb1=oVJQA@mail.gmail.com
Backpatch: 11-, where JIT compilation was introduced

Author: anarazel

contrib/auto_explain/auto_explain.c

@@ -16,6 +16,7 @@
 
 #include "commands/explain.h"
 #include "executor/instrument.h"
+#include "jit/jit.h"
 #include "utils/guc.h"
 
 PG_MODULE_MAGIC;
@@ -361,6 +362,9 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
 			ExplainPrintPlan(es, queryDesc);
 			if (es->analyze && auto_explain_log_triggers)
 				ExplainPrintTriggers(es, queryDesc);
+			if (queryDesc->estate->es_jit && es->costs &&
+				queryDesc->estate->es_jit->created_functions > 0)
+				ExplainPrintJIT(es, queryDesc);
 			ExplainEndOutput(es);
 
 			/* Remove last line break */