Speed up bytearray creation from list and tuple

[kumaraditya303]

BPO	46993
Nosy	@gvanrossum, @asvetlov, @kumaraditya303
PRs	bpo-46993: Speed up bytearray creation from list and tuple #31834

^{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 = <Date 2022-03-15.14:49:22.422>
created_at = <Date 2022-03-12.09:40:17.081>
labels = ['interpreter-core', '3.11', 'performance']
title = 'Speed up bytearray creation from list and tuple'
updated_at = <Date 2022-03-15.14:49:22.422>
user = 'https://github.com/kumaraditya303'

bugs.python.org fields:

activity = <Date 2022-03-15.14:49:22.422>
actor = 'asvetlov'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-15.14:49:22.422>
closer = 'asvetlov'
components = ['Interpreter Core']
creation = <Date 2022-03-12.09:40:17.081>
creator = 'kumaraditya'
dependencies = []
files = []
hgrepos = []
issue_num = 46993
keywords = []
message_count = 2.0
messages = ['414987', '415244']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'asvetlov', 'kumaraditya']
pr_nums = ['31834']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue46993'
versions = ['Python 3.11']

[kumaraditya303]

The attached PR speeds up bytearray creation from list and tuple.

Benchmark (uses pyperf):
-----------------------------------------------------

import pyperf

runner = pyperf.Runner()
runner.timeit(name="bench bytearray",
 stmt="bytearray([42]*10000)",)

---

Results:

-----------------------------------------------------
Mean +- std dev: [base] 74.8 us +- 5.5 us -> [patch] 53.2 us +- 3.3 us: 1.41x faster
-----------------------------------------------------

[asvetlov]

New changeset 6dfe09f by Kumar Aditya in branch 'main':
bpo-46993: Speed up bytearray creation from list and tuple (GH-31834)
6dfe09f