annotate mercurial/__init__.py @ 52178:bcd4962e0df9

rust-revlog: don't create an in-memory nodemap for filelogs from Python

Explanations inline.

Benchmarks from this change affect positively the only repo that showed this
being a problem:

```
### data-env-vars.name            = mozilla-try-2024-03-26-ds2-pnm
  # benchmark.name                = hg.command.cat
  # bin-env-vars.hg.flavor        = rust
  # bin-env-vars.hg.py-re2-module = default
  # benchmark.variants.files      = all-root
  # benchmark.variants.output     = plain
  # benchmark.variants.rev        = tip
default:           62.848869  ~~~~~
before-this-patch: 58.113051   (-7.54%, -4.74)
this-patch:        57.407533   (-8.66%, -5.44)
### data-env-vars.name            = mozilla-try-2024-03-26-ds2-pnm
  # benchmark.name                = hg.command.log
  # bin-env-vars.hg.flavor        = rust
  # bin-env-vars.hg.py-re2-module = default
  # benchmark.variants.limit-rev  = 10
  # benchmark.variants.patch      = yes
  # benchmark.variants.rev        = none
default:           3.173532  ~~~~~
before-this-patch: 3.543591  (+11.66%, +0.37)
this-patch:        3.297235   (+3.90%, +0.12)
```

# __init__.py - Startup and module loading logic for Mercurial.
#
# Copyright 2015 Gregory Szorc <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import annotations

# Allow 'from mercurial import demandimport' to keep working.
import hgdemandimport

demandimport = hgdemandimport