Regressions on lto at revision 150786 vs revision 150733

[H.J. Lu ia32]

New failures:
ERROR: (DejaGnu) proc "libgomp_target_compile lto1521.c lto1521.exe executable {{additional_flags=-O0 -flto}}" does not exist.

New passes:
FAIL: 27_io/basic_filebuf/underflow/wchar_t/9178.cc execution test
ERROR: (DejaGnu) proc "libgomp_target_compile lto30302.c lto30302.exe executable {{additional_flags=-O0 -flto}}" does not exist.