[Bug c++/21421] [3.4/4.0/4.1 Regression] Accepts writting to const via asm

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |3.4.0 3.0.4 3.3.3 4.0.0
                   |                            |4.1.0
      Known to work|                            |2.95.3
   Target Milestone|---                         |3.4.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21421