Fixed an SMS patch following comments received in the gcc@ ml. While testing the fix I discovered another issue-- latest mainline ICEs with SMS flags while building libgcc on ARM configured with --with-arch=armv7-a. This new failure does not seem to be related to the above fix and I'm now investigating it.

Looked at code generated for spec2006's libquantum, hmmer and cactusADM_base benchmarks.