Cover brin/gin/gist/spgist ambuildempty routines in regression tests

Changing some TEMP or permanent tables to UNLOGGED is sufficient to
invoke these ambuildempty routines, which were all not uncovered by any
tests.  These changes do not otherwise affect the test suite.

Author: Amul Sul <sulamul@gmail.com>
Discussion: https://postgr.es/m/CAAJ_b95nneRCLM-=qELEdgCYSk6W_++-C+Q_t+wH3SW-hF50iw@mail.gmail.com

src/test/regress/expected/brin.out

@@ -484,7 +484,7 @@ ERROR:  block number out of range: -1
 SELECT brin_summarize_range('brin_summarize_idx', 4294967296);
 ERROR:  block number out of range: 4294967296
 -- test value merging in add_value
-CREATE TABLE brintest_2 (n numrange);
+CREATE UNLOGGED TABLE brintest_2 (n numrange);
 CREATE INDEX brinidx_2 ON brintest_2 USING brin (n);
 INSERT INTO brintest_2 VALUES ('empty');
 INSERT INTO brintest_2 VALUES (numrange(0, 2^1000::numeric));

src/test/regress/expected/gin.out

@@ -74,7 +74,7 @@ select count(*) > 0 as ok from gin_test_tbl where i @> array[1];
 
 reset gin_fuzzy_search_limit;
 -- Test optimization of empty queries
-create temp table t_gin_test_tbl(i int4[], j int4[]);
+create unlogged table t_gin_test_tbl(i int4[], j int4[]);
 create index on t_gin_test_tbl using gin (i, j);
 insert into t_gin_test_tbl
 values

src/test/regress/expected/gist.out

@@ -36,7 +36,7 @@ reindex index gist_pointidx;
 --
 -- Test Index-only plans on GiST indexes
 --
-create table gist_tbl (b box, p point, c circle);
+create unlogged table gist_tbl (b box, p point, c circle);
 insert into gist_tbl
 select box(point(0.05*i, 0.05*i), point(0.05*i, 0.05*i)),
        point(0.05*i, 0.05*i),

src/test/regress/expected/spgist.out

@@ -26,7 +26,7 @@ vacuum spgist_point_tbl;
 -- Test rescan paths (cf. bug #15378)
 -- use box and && rather than point, so that rescan happens when the
 -- traverse stack is non-empty
-create table spgist_box_tbl(id serial, b box);
+create unlogged table spgist_box_tbl(id serial, b box);
 insert into spgist_box_tbl(b)
 select box(point(i,j),point(i+s,j+s))
   from generate_series(1,100,5) i,

src/test/regress/sql/brin.sql

@@ -449,7 +449,7 @@ SELECT brin_summarize_range('brin_summarize_idx', -1);
 SELECT brin_summarize_range('brin_summarize_idx', 4294967296);
 
 -- test value merging in add_value
-CREATE TABLE brintest_2 (n numrange);
+CREATE UNLOGGED TABLE brintest_2 (n numrange);
 CREATE INDEX brinidx_2 ON brintest_2 USING brin (n);
 INSERT INTO brintest_2 VALUES ('empty');
 INSERT INTO brintest_2 VALUES (numrange(0, 2^1000::numeric));

src/test/regress/sql/gin.sql

@@ -52,7 +52,7 @@ select count(*) > 0 as ok from gin_test_tbl where i @> array[1];
 reset gin_fuzzy_search_limit;
 
 -- Test optimization of empty queries
-create temp table t_gin_test_tbl(i int4[], j int4[]);
+create unlogged table t_gin_test_tbl(i int4[], j int4[]);
 create index on t_gin_test_tbl using gin (i, j);
 insert into t_gin_test_tbl
 values

src/test/regress/sql/gist.sql

@@ -41,7 +41,7 @@ reindex index gist_pointidx;
 -- Test Index-only plans on GiST indexes
 --
 
-create table gist_tbl (b box, p point, c circle);
+create unlogged table gist_tbl (b box, p point, c circle);
 
 insert into gist_tbl
 select box(point(0.05*i, 0.05*i), point(0.05*i, 0.05*i)),

src/test/regress/sql/spgist.sql

@@ -34,7 +34,7 @@ vacuum spgist_point_tbl;
 -- use box and && rather than point, so that rescan happens when the
 -- traverse stack is non-empty
 
-create table spgist_box_tbl(id serial, b box);
+create unlogged table spgist_box_tbl(id serial, b box);
 insert into spgist_box_tbl(b)
 select box(point(i,j),point(i+s,j+s))
   from generate_series(1,100,5) i,