[patch] Use LDPR_PREVAILING_DEF for symbols in -u

[Rafael Avila de Espindola]

Using the gold plugin I noticed that symbols passed to -u were still 
reported as LDPR_PREVAILING_DEF_IRONLY. I believe the correct behaviour 
would be to return LDPR_PREVAILING_DEF. This is useful for example for 
letting the linker (and therefore the compiler) know of references that 
exist only in inline assembly.

2010-02-04  Rafael Ávila de Espíndola <respindola@mozilla.com>

	* plugin.cc (is_visible_from_outside): Return true for symbols
	in the -u option.

Cheers,
Rafael
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