This patch factors out the part of printInstruction that gets the mnemonic string for a given MCInst. This is intended to be used subsequently for the instruction-mix remarks to display the final mnemonic (D90040). Unfortunately making `getMnemonic` available to the AsmPrinter seems to require making it virtual. Not sure if there's a way around that with the current layering of the AsmPrinters. Reviewed By: Paul-C-Anagnostopoulos Differential Revision: https://reviews.llvm.org/D90039
To-do ----- * Instruction encodings * Tailcalls * Investigate loop alignment * Add builtins