Add regen-frozen makefile target

[nascheme]

BPO	39448
Nosy	@nascheme, @hroncok
PRs	bpo-39448: Add regen-frozen makefile target. #18174

^{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 2021-02-19.00:50:21.120>
created_at = <Date 2020-01-24.20:52:47.887>
labels = ['type-feature']
title = 'Add regen-frozen makefile target'
updated_at = <Date 2021-03-02.14:41:26.645>
user = 'https://github.com/nascheme'

bugs.python.org fields:

activity = <Date 2021-03-02.14:41:26.645>
actor = 'hroncok'
assignee = 'none'
closed = True
closed_date = <Date 2021-02-19.00:50:21.120>
closer = 'nascheme'
components = []
creation = <Date 2020-01-24.20:52:47.887>
creator = 'nascheme'
dependencies = []
files = []
hgrepos = []
issue_num = 39448
keywords = ['patch']
message_count = 3.0
messages = ['360655', '387274', '387934']
nosy_count = 2.0
nosy_names = ['nascheme', 'hroncok']
pr_nums = ['18174']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue39448'
versions = []

[nascheme]

Updating the frozen module "__hello__" code inside Python/frozen.c is currently a manual process. That's a bit tedious since it adds some extra work in the case that bytecode changes are made. I've created a small script and a makefile target to automates the process.

[nascheme]

New changeset ffa55d2 by Neil Schemenauer in branch 'master':
bpo-39448: Add regen-frozen makefile target. (GH-18174)
ffa55d2

[hroncok]

I think something is broken with this, full report in: https://bugs.python.org/issue43372