Regressions on trunk at revision 250362 vs revision 250336

[H.J. Lu Intel64 -fpic -mcmodel=medium -mcmodel=large]

New failures:
FAIL: g++.dg/ext/sync-4.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++11 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++14 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++98 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++98 execution test
FAIL: g++.dg/ext/sync-4.C  -std=gnu++98 execution test

New passes:
FAIL: 21_strings/basic_string/modifiers/insert/char/1.cc execution test
FAIL: 21_strings/basic_string/modifiers/insert/char/1.cc execution test
FAIL: 21_strings/basic_string/modifiers/insert/char/1.cc execution test
FAIL: g++.dg/debug/debug9.C -gstabs+1 -O2 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs+1 -O2 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs+1 -O2 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs+1 -O3 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs+1 -O3 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs+1 -O3 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs1 -O2 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs1 -O2 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs1 -O2 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs1 -O3 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs1 -O3 (test for excess errors)
FAIL: g++.dg/debug/debug9.C -gstabs1 -O3 (test for excess errors)