Regressions on trunk at revision 262287 vs revision 262278

[H.J. Lu ia32]

New failures:
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line . sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line . sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line . sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line . sizeof (a) == 6

New passes:
FAIL: gcc.dg/guality/vla-1.c   -O1  -DPREVENT_OPTIMIZATION  line 17 sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c   -O2  -DPREVENT_OPTIMIZATION  line 17 sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line 17 sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fno-use-linker-plugin -flto-partition=none  -DPREVENT_OPTIMIZATION line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 17 sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c   -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects  -DPREVENT_OPTIMIZATION line 24 sizeof (a) == 17 * sizeof (short)
FAIL: gcc.dg/guality/vla-1.c   -O3 -g  -DPREVENT_OPTIMIZATION  line 17 sizeof (a) == 6
FAIL: gcc.dg/guality/vla-1.c   -Os  -DPREVENT_OPTIMIZATION  line 17 sizeof (a) == 6