Commit 394231b3

 aded
CCS_OVERHEAD annotation to 'rts/Apply.cmm'.

Before the change CCS_OVERHEAD was used only in C code.

The change exports CCS_OVERHEAD to STG.

Fixes UNREG build failure:
  rts_dist_HC rts/dist/build/Apply.p_o
    /tmp/ghc29563_0/ghc_4.hc: In function 'cm_entry':

    /tmp/ghc29563_0/ghc_4.hc:73:13: error:
     error: 'CCS_OVERHEAD' undeclared (first use in this function)
     *((P_)((W_)&CCS_OVERHEAD+72)) = ...
                 ^~~~~~~~~~~~

Signed-off-by: Sergei Trofimovich <siarheit@google.com>