storage: fix reverse scan check memory locks (#11447)

[ti-srebot]

cherry-pick #11447 to release-5.2
You can switch your code base to this Pull Request by using git-extras:

# In tikv repo:
git pr https://github.com/tikv/tikv/pull/11455

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git push git@github.com:ti-srebot/tikv.git pr/11455:release-5.2-4429fdcc7ef5

---

Signed-off-by: youjiali1995 zlwgx1023@gmail.com

What problem does this PR solve?

Issue Number:close #11440

Problem Summary:

Reverse scan's start_key is greater than end_key, but storage always uses [start_key, end_key) to check memory locks.

What is changed and how it works?

What's Changed:

Swap start_key and end_key if is a reverse scan.

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Side effects

Release note

Fix the issue that reverse scan can't detect memory locks and may read stale data.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• sticnarf
• youjiali1995

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[ti-srebot]

/run-all-tests

[ti-srebot]

@youjiali1995 you're already a collaborator in bot's repo.

[MyonKeminta]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6201a07

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

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