Inline PyEval_EvalFrameEx() in callers

The PEP 523 modified PyEval_EvalFrameEx(): it's now an indirection to
interp->eval_frame().

Inline the call in performance critical code. Leave PyEval_EvalFrame()
unchanged, this function is only kept for backward compatibility.
diff --git a/Python/ceval.c b/Python/ceval.c
index c6c6e05..c4507fb 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4069,7 +4069,7 @@
         return gen;
     }
 
-    retval = PyEval_EvalFrameEx(f,0);
+    retval = tstate->interp->eval_frame(f, 0);
 
 fail: /* Jump here from prelude on failure */
 
@@ -4822,7 +4822,7 @@
         Py_INCREF(*args);
         fastlocals[i] = *args++;
     }
-    result = PyEval_EvalFrameEx(f,0);
+    result = tstate->interp->eval_frame(f,0);
 
     ++tstate->recursion_depth;
     Py_DECREF(f);