For PR950:

Update for signless integer types and parameter attribute implementation.
Of significant note:
  1. This changes the bytecode format yet again.
  2. There are 1/2 as many integer type planes (this is a good thing)
  3. GEP indices now use only 1 bit to identify their type which means
     more GEP instructions won't be relegated to format 0 (size win)
  4. Parameter attributes are implemented but currently being stored
     verbosely for each function type. Some other day this needs to be
     optimized for size.

llvm-svn: 32783