Revert "gh-107265: Ensure _PyCode_Quicken does not handle ENTER_EXECU…

[corona10]

…TOR (gh-108460)"

This reverts commit d6ac5c7.

• Issue: Decoding instructions should handle ENTER_EXECUTOR #107265

[corona10]

(.oss) ➜ cpython git:(gh-107265-_PyCode_Quicken-revert) ✗ ./python.exe -Xuops -m test test_sys
Raised RLIMIT_NOFILE: 256 -> 1024
0:00:00 load avg: 7.68 Run tests sequentially
0:00:00 load avg: 7.68 [1/1] test_sys
Assertion failed: (opcode != ENTER_EXECUTOR), function _PyCode_Quicken, file specialize.c, line 304.
Fatal Python error: Aborted
Current thread 0x0000000104dbc580 (most recent call first):
<no Python frame>
Extension modules: _xxsubinterpreters, _xxinterpchannels, _testinternalcapi (total: 3)
[1] 20667 abort ./python.exe -Xuops -m test test_sys

[corona10]

@gvanrossum
Even if we revert this assertion, I still think that decoding instruction to JUMP_BACKWARD is not needed since it's only counter-initialization.

cpython/Python/specialize.c

Line 305 in 66b4d9c

instructions[i+1].cache=adaptive_counter_warmup();

cpython/Include/internal/pycore_code.h

Lines 436 to 440 in 66b4d9c

	staticinlineuint16_t
	adaptive_counter_bits(intvalue, intbackoff) {
	return (value << ADAPTIVE_BACKOFF_BITS) |
	(backoff& ((1<<ADAPTIVE_BACKOFF_BITS)-1));
	}

We are in the same line, or do you have different ideas?

[gvanrossum]

See #108488