Regressions on trunk at revision 216506 vs revision 216465

[H.J. Lu Intel64 Core i7]

New failures:

New passes:
FAIL: gcc.dg/guality/pr54693-2.c   -Os  line 21 x == 10 - i
FAIL: gcc.dg/guality/pr54693-2.c   -Os  line 21 y == 20 - 2 * i
FAIL: gcc.target/i386/avx512f-vec-unpack.c (internal compiler error)
FAIL: gcc.target/i386/avx512f-vec-unpack.c (internal compiler error)
FAIL: gcc.target/i386/avx512f-vec-unpack.c (test for excess errors)
FAIL: gcc.target/i386/avx512f-vec-unpack.c (test for excess errors)