BUG #13498: make check failures

The following bug has been logged on the website:

Bug reference:      13498
Logged by:          Pete Lancashire
Email address:      pete@petelancashire.com
PostgreSQL version: 9.4.4
Operating system:   AIX
Description:

Environment
oslevel -s 7100-03-03-1415
/usr/bin/ld: LD 7.1.3(4/1/14)
IBM XL C/C++ for AIX, V12.1 (5765-J02, 5725-C72)
Version: 12.01.0000.0000
Driver Version: 12.01(C/C++) Level: 120315
C Front End Version: 12.01(C/C++) Level: 120322
C++ Front End Version: 12.01(C/C++) Level: 120315
High-Level Optimizer Version: 12.01(C/C++) and 14.01(Fortran) Level: 120315
Low-Level Optimizer Version: 12.01(C/C++) and 14.01(Fortran) Level: 120321

OBJECT_MODE 64

CC       xlc_r
CXX      xlc++_r

LDFLAGS  -L/usr/local/lib64 -L/usr/local/lib -bmaxdata:0x80000000 -brtl

CFLAGS <-O see below> -qmaxmem=-1 -qarch=pwr7 -qtune=pwr7 -qcache=auto
-I/usr/local/include

CXXFLAGS=$CFLAGS

LDPATH   /usr/local/lib:/usr/lib

make runs w/o errors

make check

-O2 passes w/o errors

-O3 with or without -strict fails
parallel group (11 tests):  create_cast create_aggregate create_function_3
drop_if_exists typed_table vacuum constraints create_table_like triggers
inherit updatable_views
     create_aggregate         ... FAILED

parallel group (20 tests):  select_distinct_on select_distinct select_having
select_implicit btree_index random hash_index delete namespace case update
select_into transactions union portals subselect arrays aggregates join
prepared_xacts
     aggregates               ... FAILED

I have regression.diffs and .out