Regressions on trunk at revision 251917 vs revision 251861

[H.J. Lu]

New failures:
FAIL: ext/special_functions/hyperg/check_nan.cc (test for excess errors)
FAIL: ext/special_functions/hyperg/check_value.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/char/12048-3.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/char/12048-4.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/char/35209.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/wchar_t/12948-1.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/wchar_t/12948-2.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/wchar_t/12948-3.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/wchar_t/12948-4.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/wchar_t/1.cc (test for excess errors)
FAIL: ext/stdio_sync_filebuf/wchar_t/35209.cc (test for excess errors)
FAIL: ext/throw_allocator/check_allocate_max_size.cc (test for excess errors)
FAIL: ext/throw_allocator/check_deallocate_null.cc (test for excess errors)
FAIL: ext/throw_allocator/check_delete.cc (test for excess errors)
FAIL: ext/throw_allocator/check_new.cc (test for excess errors)
FAIL: ext/throw_allocator/deallocate_global.cc (test for excess errors)
FAIL: ext/throw_allocator/deallocate_local.cc (test for excess errors)
FAIL: gcc.dg/tree-prof/merge_block.c scan-tree-dump-times optimized "x_..D. \\| y_..D." 4
FAIL: gcc.target/i386/mpx/return-struct-6-ubv.c   -O1  (test for excess errors)
FAIL: gcc.target/i386/mpx/return-struct-6-ubv.c   -O2  (test for excess errors)
FAIL: gcc.target/i386/mpx/return-struct-6-ubv.c   -O3 -g  (test for excess errors)

New passes: