[committed] Testsuite: Various fixes for nios2.

[Sandra Loosemore]

I've pushed the attached patch to clean up some test failures I've seen 
on nios2-elf.  This target defaults to -fno-delete-null-pointer-checks 
so any optimization tests that depend on assumptions that valid pointers 
are non-zero have to be marked explicitly.  The others ought to be 
obvious, except perhaps struct-by-value-1.c which was giving a link 
error about overflowing the small data region without -G0.

My last set of test results were pretty messy but I think almost all of 
the problems are not nios2-specific (e.g., PR103166, PR103163).  I think 
it is better to wait until we're into stage 3 and the churn settles down 
some before I make another pass to triage remaining nios2-specific 
problems, but I might as well check in what I have now instead of 
sitting on it.

-Sandra
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