bpo-40925: Remove unused stack macro SET_VALUE (GH-20783)

Author: corona10

Python/ceval.c

@@ -1157,7 +1157,6 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, PyFrameObject *f, int throwflag)
 #define SET_SECOND(v)     (stack_pointer[-2] = (v))
 #define SET_THIRD(v)      (stack_pointer[-3] = (v))
 #define SET_FOURTH(v)     (stack_pointer[-4] = (v))
-#define SET_VALUE(n, v)   (stack_pointer[-(n)] = (v))
 #define BASIC_STACKADJ(n) (stack_pointer += n)
 #define BASIC_PUSH(v)     (*stack_pointer++ = (v))
 #define BASIC_POP()       (*--stack_pointer)