[TableGen] Changes to AsmWriterEmitter to remove the CodeGenInstruction to AsmWriterInst map. NFC

Adds the corresponding CodeGenInstruction number to each AsmWriterInst. Then write all the operand uniqueing loops using the AsmWriterInst array and indices. Then use the CodeGenInstruction index to fill out the OpCodeInfo array.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258005 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed