[PATCH,committed] Fix PR12166.

[Dave Korn]

    Hi list,


  The attached patch fixes PR12166.  The bug is caused by the code that
derives a mangled weak external aux symbol name being overcautious about
something that can't happen (attempting to de-prefix a name after it has also
had a uniquify-ing suffix added), but the overcautious code does get falsely
tripped when there's a dot in the symbol.  The same symbol never gets frobbed
twice, so all this is unnecessary.

gas/ChangeLog:

2010-11-05  Dave Korn  <...redacted...>

	* config/obj-coff.c (weak_altname2name): Don't infer from the presence
	of a period that the symbol has been already uniquify-d.
	(weak_uniquify): Don't worry that the symbol might have been already
	uniquify-d.

  Bootstrapped and tested i686-pc-cygwin, then used for several GCC
bootstrap-and-test cycles with no anomalies.  Committed.

    cheers,
      DaveK

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