[Xtensa] avoid extra relocations in .eh_frame

[Bob Wilson]

In preparation for getting the Xtensa port of GCC to use DWARF2  
unwinding, I'm committing this patch to the assembler.  References to  
the .eh_frame section do not need any extra relocations due to Xtensa- 
specific relaxation, and the linker will choke if it encounters  
unexpected relocations in .eh_frame.  I tested an xtensa-elf build  
and verified that this causes no regressions.

2007-11-07  Bob Wilson  <bob.wilson@acm.org>

         * config/tc-xtensa.c (relaxable_section): Check for .eh_frame.

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