added Target.createMCSubtargetInfo and createMCDisassembler

also added bindings to classes required by the target methods. also
added a convenience function to initialize all target components to
the llvm module

llvm/mc/__init__.py

@@ -0,0 +1,26 @@
+from io import BytesIO
+import contextlib
+
+import llvm
+from llvmpy import api
+
+class Disassembler(llvm.Wrapper):
+
+    @staticmethod
+    def new(triple='', cpu='', features=''):
+        if not triple:
+            triple = api.llvm.sys.getDefaultTargetTriple()
+
+        with contextlib.closing(BytesIO()) as error:
+            target = api.llvm.TargetRegistry.lookupTarget(triple, error)
+            if not target:
+                raise llvm.LLVMException(error)
+            if not target.hasMCDisassembler():
+                raise llvm.LLVMException(target, "No disassembler provided for %s." % triple)
+
+            sti = target.createMCSubtargetInfo(triple, cpu, features)
+            if not sti:
+                raise llvm.LLVMException("Could not create sub target info")
+
+            return target.createMCDisassembler(sti)
+