Spurred by Segher's RFC, I went ahead and tested several ports with LRA 
enabled.  Not surprisingly, many failed, but a few built their full set 
of libraries successful and of those a few even ran their testsuites 
with no regressions.  In fact, enabling LRA fixes a small number of 
failures on the iq2000 port.

This patch converts the ports which built their libraries and have test 
results that are as good as or better than without LRA.    There may be 
minor code quality regressions or there may be minor code quality 
improvements -- I'm leaving that for the port maintainers to own going 
forward.

Committed to the trunk,

jeff