Slow _bfd_strip_section_from_output

[H. J. Lu]

_bfd_strip_section_from_output is known to be very slow:

http://sourceware.org/ml/binutils/2005-03/msg00826.html

It scans every section in all input files to find a match. We do
have link_order_head/link_order_tail. But they aren't available
when _bfd_strip_section_from_output is called. Can we build them
when we assign the output sections and fix them up before we need
them for output?


H.J.