[Xtensa] fix problem in new __umulsidi3 function

[Bob Wilson]

The last change I made was missing an instruction to restore the original return 
address in __umulsidi3.  This did not show up before because I only tested 
Xtensa processor configurations that included integer multiply instructions, in 
which case the return address does not get clobbered.  Committed on mainline.

2006-11-17  Bob Wilson  <bob.wilson@acm.org>

	* config/xtensa/lib1funcs.asm (__umulsidi3): Restore a0 on exit.


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