re PR c++/27961 (ICE on invalid template declaration)

       PR c++/27961
       * decl.c (start_decl): Return error_mark_node if a
       function is initialized like a variable.
       (check_var_type): If a variable of field is declared void,
       set the type to error_mark_node.
       (grokdeclarator): Check the return type of check_var_type.
       * class.c (finish_struct_1): Robustify.

       * g++.dg/template/crash60.C: New test.
       * g++.dg/other/large-size-array.C: Adjust error markers.
       * g++.dg/parse/crash27.C: Likewise.
       * g++.dg/template/crash1.C: Likewise.

From-SVN: r117671