Add T_IMEMO support to lldb

I'm trying to find why a reference to an IMEMO object isn't being
updated

misc/lldb_cruby.py

@@ -236,6 +236,12 @@ def lldb_inspect(debugger, target, result, val):
             tRTypedData = target.FindFirstType("struct RMoved").GetPointerType()
             val = val.Cast(tRTypedData)
             append_command_output(debugger, "p *(struct RMoved *) %0#x" % val.GetValueAsUnsigned(), result)
+        elif flType == RUBY_T_IMEMO:
+            # I'm not sure how to get IMEMO_MASK out of lldb. It's not in globals()
+            imemo_type = (flags >> RUBY_FL_USHIFT) & 0x0F # IMEMO_MASK
+            print("T_IMEMO: ", file=result)
+            append_command_output(debugger, "p (enum imemo_type) %d" % imemo_type, result)
+            append_command_output(debugger, "p *(struct MEMO *) %0#x" % val.GetValueAsUnsigned(), result)
         else:
             print("Not-handled type %0#x" % flType, file=result)
             print(val, file=result)