update of old PL/SQL PLpgSQL and SQLPL patch based on current version

see [linguist] add support for oracle PLSQL (#1003)

samples/PLpgSQL/plpgsql_lint-8.4.sql

@@ -0,0 +1,165 @@
+load 'plpgsql';
+load 'plpgsql_lint';
+
+create table t1(a int, b int);
+
+create function f1()
+returns void as $$
+begin
+  if false then
+    update t1 set c = 30;
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+
+create function g1(out a int, out b int)
+as $$
+  select 10,20;
+$$ language sql;
+
+create function f1()
+returns void as $$
+declare r record;
+begin
+  r := g1();
+  if false then 
+    raise notice '%', r.c;
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+drop function g1();
+
+create function g1(out a int, out b int)
+returns setof record as $$
+select * from t1;
+$$ language sql;
+
+create function f1()
+returns void as $$
+declare r record;
+begin
+  for r in select * from g1()
+  loop
+    raise notice '%', r.c;
+  end loop;
+end;
+$$ language plpgsql;
+
+select f1();
+
+create or replace function f1()
+returns void as $$
+declare r record;
+begin
+  for r in select * from g1()
+  loop
+    r.c := 20;
+  end loop;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+drop function g1();
+
+create function f1()
+returns int as $$
+declare r int;
+begin
+  if false then
+    r := a + b;
+  end if;
+  return r;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+
+create or replace function f1()
+returns void as $$
+begin
+  if false then
+    raise notice '%', 1, 2;
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+
+create or replace function f1()
+returns void as $$
+begin
+  if false then
+    raise notice '% %';
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+
+create or replace function f1()
+returns void as $$
+declare r int[];
+begin
+  if false then
+    r[c+10] := 20;
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+
+
+create or replace function f1()
+returns void as $$
+declare r int;
+begin
+  if false then
+    r[10] := 20;
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();
+
+create type diagnostic_info_type as (
+  status text,
+  message text,
+  detail text,
+  row_count int);
+
+create or replace function f1()
+returns void as $$
+declare
+  dg record;
+begin
+  dg := NULL::diagnostic_info_type;
+  if false then
+    dg.status := '00000';
+    dg.mistake := 'hello';
+  end if;
+end;
+$$ language plpgsql;
+
+select f1();
+
+drop function f1();