This patch is part of a bigger one D50314. It adds a possibility to emit a
logical operands info.
This feature can be used to simplify CISC machine code emission as it done in
M68K D50314 patch. You can check out M680x0MCCodeEmitter.cpp to see how it is
used. In short, it gives a "logical view" onto machine instruction operands
list, as it was defined in the tablegen files.
The main changes are in MCInstrDesc.h and InstrInfoEmitter.cpp, the rest of the
diff is just renaming for consistency sake.