merging it into a Token field in Operand, and moving the first
token to an explicit mnemonic field. These were parallel
arrays before (except for the mnemonic) which kept confusing me.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118024 91177308-0d34-0410-b5e6-96231b3b80d8