Regressions on trunk at revision 164242 vs revision 164226

[H.J. Lu Intel64]

New failures:

New passes:
FAIL: g++.dg/opt/pr30965.C scan-tree-dump-times optimized "variable_..D. = v_..D." 2
FAIL: g++.dg/tree-ssa/pointer-reference-alias.C scan-tree-dump-times optimized "\*a" 1
FAIL: g++.dg/tree-ssa/pr27090.C scan-tree-dump optimized "f_..D.->x;"