gold patch committed: Don't crash with -s -r

[Ian Lance Taylor]

I haven't been able to recreate PR 12695.  However, while looking at it
I did see a possible linker crash with the somewhat unlikely combination
of -s -r.  This patch fixes the problem, by not trying to get the
section index of the .symtab section if there is no such section.
Committed to mainline.

Ian


2011-06-29  Ian Lance Taylor  <iant@google.com>

	PR gold/12695
	* layout.cc (Layout::symtab_section_shndx): New function.
	* layout.h (class Layout): Declare symtab_section_shndx.
	* output.cc (Output_section::write_header): Call it.


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