Regressions on 4.6 at revision 182410 vs revision 182173

[Kirill Yukhin [ia32 Core i7 AVX]]

New failures:
ERROR: g++.dg/cpp0x/rv-cast3.C: syntax error in target selector "target c++11" for " dg-do 2 run { target c++11 } "
ERROR: g++.dg/cpp0x/rv-cast4.C: syntax error in target selector "target c++11" for " dg-do 2 compile { target c++11 } "
WARNING: program timed out.

New passes: