Commit patch #3 of 4 for Power7 VSX support

boehm-gc/ChangeLog

boehm-gc/include/private/gc_locks.h

gcc/ChangeLog

gcc/config/rs6000/altivec.md

gcc/config/rs6000/constraints.md

gcc/config/rs6000/predicates.md

gcc/config/rs6000/rs6000-c.c

gcc/config/rs6000/rs6000.c

gcc/config/rs6000/rs6000.h

gcc/config/rs6000/rs6000.md

gcc/config/rs6000/rs6000.opt

gcc/config/rs6000/t-rs6000

gcc/config/rs6000/vector.md