[LTO] Fix inconsistent architecture errors on the SPARC

[Eric Botcazou]

As explained in http://sourceware.org/ml/binutils/2010-03/msg00012.html, we 
can have inconsistent architecture errors on the SPARC in 32-bit mode with 
GNU as when lto1 is loading object files.

SPARC maintainers are of the opinion that lto1 should allow mixing v8 and v8+ 
object files like the linker, hence the attached patch.

Tested on SPARC/Solaris 32-bit and 64-bit, OK for mainline?


2010-03-02  Eric Botcazou  <ebotcazou@adacore.com>

	* lto-elf.c (is_compatible_architecture): New static function.
	(DEFINE_VALIDATE_EHDR): Use it to validate the architecture.


-- 
Eric Botcazou
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