Regressions on releases/gcc-10 at commit r10-9419 vs commit r10-9392 on Linux/i686

[H.J. Lu]

New failures:
FAIL: gcc.dg/attr-flatten-1.c  (test for warnings, line 13)
FAIL: libstdc++-prettyprinters/libfundts.cc print a
FAIL: libstdc++-prettyprinters/libfundts.cc print ab
FAIL: libstdc++-prettyprinters/libfundts.cc print ai
FAIL: libstdc++-prettyprinters/libfundts.cc print ap
FAIL: libstdc++-prettyprinters/libfundts.cc print as
FAIL: libstdc++-prettyprinters/libfundts.cc print as2
FAIL: libstdc++-prettyprinters/libfundts.cc print om
FAIL: libstdc++-prettyprinters/libfundts.cc print op
FAIL: libstdc++-prettyprinters/libfundts.cc print os

New passes: