[patch][rfc] Enabling more optimizations with -ON

[Rafael Espíndola]

In compilers the -ON options enable various optimizations. Different
compilers (and compiler versions) have different ones, but the option
itself is commonly available and selects a somewhat corresponding
level.

In both bfd ld and gold very few optimizations are enabled with the
-ON options. This means that users have to know which optimizations
are available:

ld ...-O3 --gc-sections --icf=safe....

If an optimization is added to one of them, a configure check has to
be used to find if the program is being linked with gold or bfd (and
which version).

As a starting point, the attached patch changes gold to gc sections by
default if given -O3 or higher. It can still be disabled with an
explicit --no-gc-sections.

Cheers,
Rafael

2014-11-03  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>

        * options.cc (General_options::finalize): Set gc_sections by default
if -O3 or higher is used.
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