Add vectorcall for float()

[sweeneyde]

BPO	41873
Nosy	@vstinner, @corona10, @sweeneyde
PRs	#22432

^{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 2020-09-29.00:58:12.992>
created_at = <Date 2020-09-28.08:55:08.091>
labels = ['interpreter-core', '3.10', 'performance']
title = 'Add vectorcall for float()'
updated_at = <Date 2021-04-06.14:49:25.534>
user = 'https://github.com/sweeneyde'

bugs.python.org fields:

activity = <Date 2021-04-06.14:49:25.534>
actor = 'corona10'
assignee = 'none'
closed = True
closed_date = <Date 2020-09-29.00:58:12.992>
closer = 'corona10'
components = ['Interpreter Core']
creation = <Date 2020-09-28.08:55:08.091>
creator = 'Dennis Sweeney'
dependencies = []
files = []
hgrepos = []
issue_num = 41873
keywords = ['patch']
message_count = 3.0
messages = ['377590', '377647', '377648']
nosy_count = 3.0
nosy_names = ['vstinner', 'corona10', 'Dennis Sweeney']
pr_nums = ['22432']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue41873'
versions = ['Python 3.10']

[sweeneyde]

I got these benchmarks:

.\python.bat -m pyperf timeit "float(0)"

Before: Mean +- std dev: 79.0 ns +- 1.0 ns
After: Mean +- std dev: 51.5 ns +- 1.6 ns

[corona10]

New changeset e8acc35 by Dennis Sweeney in branch 'master':
bpo-41873: Add vectorcall for float() (GH-22432)
e8acc35

[corona10]

Now float() is faster!
Thank you for your contribution, Dennis :)
And thank you Victor as co-reviewer!