[X86] Rename some instructions from 'rb' to 'rrb' to make 'b' a proper suffix....

[X86] Rename some instructions from 'rb' to 'rrb' to make 'b' a proper suffix. Fix the scheduling information for some of them.

Some of the scheduling information was only present for the 'rb' version' and not the 'rr' version. Now we match 'rr(b?)'

llvm-svn: 320320