Make every Python API __len__() method return a PyIntObject.

swig 2.0+ seems to default to using PyLongObjects, but the __len__()
method _must_ return a PyIntObject.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@156639 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/scripts/Python/interface/SBThread.i b/scripts/Python/interface/SBThread.i
index 93fd7f9..295a775 100644
--- a/scripts/Python/interface/SBThread.i
+++ b/scripts/Python/interface/SBThread.i
@@ -182,7 +182,7 @@
 
             def __len__(self):
                 if self.sbthread:
-                    return self.sbthread.GetNumFrames()
+                    return int(self.sbthread.GetNumFrames())
                 return 0
             
             def __getitem__(self, key):