[Bug #1542016] Report PCALL_POP value. This makes the return value of sys.callstats() match its docstring.

Backport candidate.  Though it's an API change, this is a pretty obscure
portion of the API.

Misc/NEWS

@@ -14,6 +14,9 @@ Core and builtins
 
 - Patch #1549049: Support long values in structmember.
 
+- Bug #1542016: make sys.callstats() match its docstring and return an
+  11-tuple (only relevant when Python is compiled with -DCALL_PROFILE).
+
 - Bug #1545497: when given an explicit base, int() did ignore NULs
   embedded in the string to convert.
 

Python/ceval.c

@@ -186,10 +186,10 @@ static int pcall[PCALL_NUM];
 PyObject *
 PyEval_GetCallStats(PyObject *self)
 {
-	return Py_BuildValue("iiiiiiiiii",
+	return Py_BuildValue("iiiiiiiiiii",
 			     pcall[0], pcall[1], pcall[2], pcall[3],
 			     pcall[4], pcall[5], pcall[6], pcall[7],
-			     pcall[8], pcall[9]);
+			     pcall[8], pcall[9], pcall[10]);
 }
 #else
 #define PCALL(O)