Fix PR target/22260

[Eric Botcazou]

This is an embarassing thinko in the new code to emit thunks without using 
delay slots if -fno-delayed-branch, for example at -O0 (retrospectively, I 
wonder whether adding this code was such a good idea), a regression present 
in the 4.x compilers.

Loading the PIC register in the thunk clobbers %o7... but also the PIC 
register itself that may have pointed to another GOT up to now.

Tested on sparc-sun-solaris2.8, applied to mainline and 4.0 branch as it's a 
serious wrong code generation bug for C++.


2005-06-30  Eric Botcazou  <ebotcazou@libertysurf.fr>

	PR target/22260
	* config/sparc/sparc.c (emit_and_preserve): Add 2nd register.
	Preserve the 2nd register too, if present.
	(sparc_output_mi_thunk) <PIC case>: Preserve the PIC register too.
	Adjust call to emit_and_preserve.

	
-- 
Eric Botcazou
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