Implement superinstruction UNPACK_SEQUENCE_ST

[zcpara]

BPO	45260
Nosy	@gvanrossum, @markshannon, @zcpara
PRs	bpo-45260: Add superinstruction, UNPACK_SEQUENCE__STORE_FAST #28519

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-09-22.06:14:37.467>
labels = ['3.11', 'performance']
title = 'Implement superinstruction UNPACK_SEQUENCE_ST'
updated_at = <Date 2021-10-09.04:44:06.023>
user = 'https://github.com/zcpara'

bugs.python.org fields:

activity = <Date 2021-10-09.04:44:06.023>
actor = 'zhangchaospecial'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = []
creation = <Date 2021-09-22.06:14:37.467>
creator = 'zhangchaospecial'
dependencies = []
files = []
hgrepos = []
issue_num = 45260
keywords = ['patch']
message_count = 1.0
messages = ['402407']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'Mark.Shannon', 'zhangchaospecial']
pr_nums = ['28519']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue45260'
versions = ['Python 3.11']

[zcpara]

PEP-659 quickening provides a mechanism for replacing instructions.

We add another super-instruction UNPACK_SEQUENCE_ST to replace the original UNPACK_SEQUENCE and the following n STROE_FAST instructions.

See faster-cpython/ideas#16.

[iritkatriel]

The PR was closed, closing the issue as well.