Also, added annotations to how instructions are modified (reg/imm operands).
Added prototype for adding register numbers to values pass for interfacing with
the target-independent register allocators in the JIT.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6366 91177308-0d34-0410-b5e6-96231b3b80d8