py/runtime0.h: Move MP_BINARY_OP_DIVMOD to the end of mp_binary_op_t.

It starts a dichotomy of mp_binary_op_t values which can't appear in the
bytecode. Another reason to move it is to VALUES of OP_* and OP_INPLACE_*
nicely adjacent. This also will be needed for OP_REVERSE_*, to be soon
introduced.

py/runtime0.h

@@ -84,7 +84,6 @@ typedef enum {
 
     MP_BINARY_OP_MODULO,
     MP_BINARY_OP_POWER,
-    MP_BINARY_OP_DIVMOD, // not emitted by the compiler but supported by the runtime
     MP_BINARY_OP_INPLACE_OR,
     MP_BINARY_OP_INPLACE_XOR,
 
@@ -99,6 +98,11 @@ typedef enum {
     MP_BINARY_OP_INPLACE_TRUE_DIVIDE,
     MP_BINARY_OP_INPLACE_MODULO,
     MP_BINARY_OP_INPLACE_POWER,
+
+    // Operations below this line don't appear in bytecode, they
+    // just identify special methods.
+
+    MP_BINARY_OP_DIVMOD, // not emitted by the compiler but supported by the runtime
 } mp_binary_op_t;
 
 typedef enum {

tests/cmdline/cmd_showbc.py.exp

@@ -132,7 +132,7 @@ Raw bytecode (code_info_size=\\d\+, bytecode_size=\\d\+):
 \\d\+ DUP_TOP_TWO
 \\d\+ LOAD_SUBSCR
 \\d\+ LOAD_FAST 12
-\\d\+ BINARY_OP 29 __iadd__
+\\d\+ BINARY_OP 28 __iadd__
 \\d\+ ROT_THREE
 \\d\+ STORE_SUBSCR
 \\d\+ LOAD_DEREF 14