gh-91870: Remove unsupported SRE opcode CALL (GH-91872)

It was initially added to support atomic groups, but that
support was never fully implemented, and CALL was only left
in the compiler, but not interpreter and parser.

ATOMIC_GROUP is now used to support atomic groups.

Lib/re/_compiler.py

@@ -164,12 +164,6 @@ def _compile(data, pattern, flags):
             _compile(data, av[1], flags)
             emit(SUCCESS)
             code[skip] = _len(code) - skip
-        elif op is CALL:
-            emit(op)
-            skip = _len(code); emit(0)
-            _compile(data, av, flags)
-            emit(SUCCESS)
-            code[skip] = _len(code) - skip
         elif op is AT:
             emit(op)
             if flags & SRE_FLAG_MULTILINE:

Lib/re/_constants.py

@@ -13,7 +13,7 @@
 
 # update when constants are added or removed
 
-MAGIC = 20220402
+MAGIC = 20220423
 
 from _sre import MAXREPEAT, MAXGROUPS
 
@@ -78,7 +78,6 @@ OPCODES = _makecodes(
     'ASSERT', 'ASSERT_NOT',
     'AT',
     'BRANCH',
-    'CALL',
     'CATEGORY',
     'CHARSET', 'BIGCHARSET',
     'GROUPREF', 'GROUPREF_EXISTS',

Lib/re/_parser.py

@@ -183,10 +183,6 @@ class SubPattern:
                     j = max(j, h)
                 lo = lo + i
                 hi = hi + j
-            elif op is CALL:
-                i, j = av.getwidth()
-                lo = lo + i
-                hi = hi + j
             elif op is ATOMIC_GROUP:
                 i, j = av.getwidth()
                 lo = lo + i