Regressions on trunk at revision 269566 vs revision 269521

[H.J. Lu (x32)]

New failures:

New passes:
FAIL: gcc.dg/guality/pr54970.c  -Og -DPREVENT_OPTIMIZATION  line 15 a[0] == 1
FAIL: gcc.dg/guality/pr54970.c  -Og -DPREVENT_OPTIMIZATION  line 20 a[0] == 1
FAIL: gcc.dg/guality/pr54970.c  -Og -DPREVENT_OPTIMIZATION  line 25 a[0] == 1
FAIL: gcc.target/i386/indirect-thunk-extern-7.c scan-assembler jmp[ \t]*__x86_indirect_thunk(_nt|)_(r|e)ax
FAIL: gcc.target/i386/indirect-thunk-extern-7.c scan-assembler mov(?:l|q)[ \t]*.L[0-9]+\\(,%