Regressions on trunk at revision 230371 vs revision 230354

[H.J. Lu x32]

New failures:
FAIL: gcc.dg/tree-ssa/split-path-1.c execution test
FAIL: g++.dg/cpp/ucn-1.C  -std=gnu++11  target { powerpc-ibm-aix* }  (test for errors, line 12)
FAIL: g++.dg/cpp/ucn-1.C  -std=gnu++14  target { powerpc-ibm-aix* }  (test for errors, line 12)
FAIL: libgomp.oacc-c++/../libgomp.oacc-c-c++-common/loop-auto-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 (internal compiler error)
FAIL: libgomp.oacc-c++/../libgomp.oacc-c-c++-common/loop-auto-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 (test for excess errors)

New passes: