[gold patch] Fix incremental linking problems with .init_array and .eh_frame sections

[Cary Coutant]

>> 2011-09-16  Cary Coutant  <ccoutant@google.com>
>>
>>       * incremental.cc (can_incremental_update): New function.
>>       * incremental.h (can_incremental_update): New function.
>>       * layout.cc (Layout::init_fixed_output_section): Call it.
>>       (Layout::make_output_section): Don't allow patch space in .eh_frame.
>>       * object.cc (Sized_relobj_file::do_layout): Call
>>       can_incremental_update.
>
> This is OK.

Thanks, committed.

-cary