bpo-39156: Break up COMPARE_OP into four logically distinct opcodes. (GH-17754)

Break up COMPARE_OP into four logically distinct opcodes:
* COMPARE_OP for rich comparisons
* IS_OP for 'is' and 'is not' tests
* CONTAINS_OP for 'in' and 'is not' tests
* JUMP_IF_NOT_EXC_MATCH for checking exceptions in 'try-except' statements.
diff --git a/Include/opcode.h b/Include/opcode.h
index 7126642..0535484 100644
--- a/Include/opcode.h
+++ b/Include/opcode.h
@@ -93,6 +93,9 @@
 #define POP_JUMP_IF_FALSE       114
 #define POP_JUMP_IF_TRUE        115
 #define LOAD_GLOBAL             116
+#define IS_OP                   117
+#define CONTAINS_OP             118
+#define JUMP_IF_NOT_EXC_MATCH   121
 #define SETUP_FINALLY           122
 #define LOAD_FAST               124
 #define STORE_FAST              125
@@ -132,11 +135,6 @@
    remaining private.*/
 #define EXCEPT_HANDLER 257
 
-
-enum cmp_op {PyCmp_LT=Py_LT, PyCmp_LE=Py_LE, PyCmp_EQ=Py_EQ, PyCmp_NE=Py_NE,
-                PyCmp_GT=Py_GT, PyCmp_GE=Py_GE, PyCmp_IN, PyCmp_NOT_IN,
-                PyCmp_IS, PyCmp_IS_NOT, PyCmp_EXC_MATCH, PyCmp_BAD};
-
 #define HAS_ARG(op) ((op) >= HAVE_ARGUMENT)
 
 #ifdef __cplusplus