gh-138912: Add fast path for match class patterns without sub-patterns

Author: cdce8p

Doc/library/dis.rst

@@ -1752,6 +1752,14 @@ iterations of the loop.
    .. versionadded:: 3.13
 
 
+.. opcode:: MATCH_CLASS_ISINSTANCE
+
+   Read match subject ``Stack[-2]`` and the type object ``Stack[-1]`` from stack.
+   Pop ``Stack[-1]`` and push ``True`` or ``False`` for the result of :func:`isinstance`.
+
+   .. versionadded:: 3.15
+
+
 .. opcode:: MATCH_CLASS (count)
 
    ``STACK[-1]`` is a tuple of keyword attribute names, ``STACK[-2]`` is the class

Include/internal/pycore_magic_number.h

@@ -292,6 +292,7 @@ Known values:
     Python 3.15a4 3659 (Add CALL_FUNCTION_EX specialization)
     Python 3.15a4 3660 (Change generator preamble code)
     Python 3.15a4 3661 (Lazy imports IMPORT_NAME opcode changes)
+    Python 3.15a7 3662 (Add MATCH_CLASS_ISINSTANCE opcode)
 
 
     Python 3.16 will start with 3700
@@ -305,7 +306,7 @@ PC/launcher.c must also be updated.
 
 */
 
-#define PYC_MAGIC_NUMBER 3661
+#define PYC_MAGIC_NUMBER 3662
 /* This is equivalent to converting PYC_MAGIC_NUMBER to 2 bytes
    (little-endian) and then appending b'\r\n'. */
 #define PYC_MAGIC_NUMBER_TOKEN \