wrong-code regressions review

[Bradley Lucier]

18548 is a regression (and it's not target specific, it happens on 
sparc-solaris, x86-linux, and ppc-darwin), but it's very hard to figure 
out what is causing the current problem.  There were two previous 
wrong-code regressions on this code base that have been fixed by 
unrelated patches, so I don't know if fixing 18548 will just bring 
other problems to the surface.

Brad