implemented binding for MCDisassembler.getInstruction

also added new llvm.mc module to act as higher level
python access to the MC section of LLVM (added Instr
and Disassembler classes).

test/example-disassemble.py

@@ -0,0 +1,31 @@
+import llvm
+
+from llvm import mc
+from llvm.mc import Disassembler
+from llvmpy import api
+
+llvm.initialize_all_target_components()
+
+
+def print_instructions(dasm, bs):
+    for (offset, inst) in dasm.decode(bs):
+        if inst is None:
+            print("\t%r=>(bad): 0, []" % (offset))
+        elif isinstance(inst, mc.BadInstr):
+            print("\t%r=>(bad)%r: %r, %r" % (offset, inst, len(inst), inst.operands()))
+        else:
+            print("\t%r=>%r: %r, %r" % (offset, inst, len(inst), inst.operands()))
+
+
+print("x86:")
+print_instructions(Disassembler.x86(), "\x01\xc3\xc3\xcc\x90")
+print("x86-64:")
+print_instructions(Disassembler.x86_64(), "\x55\x48\x89\xe8")
+#print("arm:")
+#code = "\xe9\x2d\x40\x08\xe5\x9f\x00\x0c\xe5\x9f\x10\x0c" + \
+#       "\xe5\x9f\x20\x0c\xe5\x9f\x30\x0c\xeb\xff\xff\xf6"
+#print_instructions(Disassembler.arm(), code)
+
+ 
+
+