[Xtensa] change relaxation of calls to weak symbols

[Bob Wilson]

I noticed yesterday that the Xtensa port of GAS has been relaxing all calls to 
weak symbols, even when the --longcalls option is disabled.  This seems wrong to 
me.  The assembler doesn't know the final address of a weak symbol, but that is 
no different than a call to a different section.  This patch changes GAS to 
handle both of those cases (weak symbol and different section) in the same way. 
  Tested with an xtensa-elf build and committed.

2007-12-12  Bob Wilson  <bob.wilson@acm.org>

         * config/tc-xtensa.c (xg_symbolic_immeds_fit): Do not relax calls to
         weak symbols if longcalls are disabled.

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