i cant find any method in llvm to automatically get the
correct instruction alignment for disassembling. i thought
it would be MCAsmInfo.getMinInstAlignment, but that value is
1 for the ARM target machine. since that is clearly the wrong
instruction alignment for disassembling arm, the user should
be able to configure the alignment to whatever is needed.
use these new bindings instead of MCInstrAnalysis bindings in
llvm.mc.Instr because MCInstrAnalaysis is just a thin layer
encapsulating MCInstrInfo that seems largely pointless.
added custom method to extra.h to return a PyBytes object
from the bytes read from MemoryObject.readBytes.
also moved the generic methods from StringRefMemoryObject
up to MemoryObject
uses binding of printInst on MCInstPrinter for printing
instruction.
also fixed a bug in llvm.mc.Disassembler.decode: idx should
start at zero, and we should pass code.getBase() + idx to
getInstruction. idx must start at zero because the while loop
compares it against code.getExtent() which returns only the
length of bs.
Disassembler now simply needs a TargetMachine object
and it will be able to access all the descriptor objects
it needs for disassembly through the target machine.
