[gold][patch] Plugin API and PIE binaries

[Rafael Espíndola]

I don't think there is any support for PIE in the current plugin api.
Gold currently only passes the plugin LDPO_EXEC, which causes problem
when the plugin then gives gold an object with invalid relocations.

The attached patches add a LDPO_PIE. I don't think this is a backward
compatibility problem, since any plugin producing code for a PIE
thinking it is a regular executable is already broken.

Cheers,
Rafael

gold patch:

2012-06-12  Rafael Ávila de Espíndola <respindola@mozilla.com>

        * plugin.cc (Plugin::load): Handle position independent executables.

include patch:

2012-06-12  Rafael Ávila de Espíndola <respindola@mozilla.com>

        *  plugin-api.h (ld_plugin_output_file_type): Add LDPO_PIE.
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