Regressions on trunk at revision 230081 vs revision 230016

[H.J. Lu ia32 Core i7]

New failures:
FAIL: gcc.dg/tree-ssa/ssa-dom-cse-2.c scan-tree-dump optimized "return 28;"
FAIL: libgomp.oacc-c/../libgomp.oacc-c-c++-common/firstprivate-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 (test for excess errors)
FAIL: libgomp.oacc-c++/../libgomp.oacc-c-c++-common/firstprivate-1.c -DACC_DEVICE_TYPE_host=1 -DACC_MEM_SHARED=1 (test for excess errors)

New passes:
FAIL: gcc.target/i386/pr66648.c (test for excess errors)
FAIL: g++.dg/cilk-plus/CK/pr66326.cc  -g -fcilkplus (test for excess errors)
FAIL: g++.dg/cilk-plus/CK/pr66326.cc  -g -O2 -fcilkplus (test for excess errors)
FAIL: g++.dg/cilk-plus/CK/pr66326.cc  -O1 -fcilkplus (test for excess errors)
FAIL: g++.dg/cilk-plus/CK/pr66326.cc  -O3 -fcilkplus (test for excess errors)
ERROR: (DejaGnu) proc "fg" does not exist.