Initial support for loongarch64

[qiangxuhui]

Changelog category (leave one):

• Build/Testing/Packaging Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Experimentally support loongarch64 as a new platform for ClickHouse.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

Information about CI checks: https://clickhouse.com/docs/en/development/continuous-integration/

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NOTE: If your merge the PR with modified CI you MUST KNOW what you are doing
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Include tests (required builds will be added automatically):

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[qiangxuhui]

@alexey-milovidov @rschu1ze Because my branch name for loongarch64 is the same as the upstream branch name for loongarch64, I renamed my branch, but this caused the PR #61509 to be closed. So I re-send this PR.

[robot-clickhouse-ci-1]

This is an automated comment for commit 5fb8ea4 with description of existing statuses. It's updated for the latest CI running

❌ Click here to open a full report in a separate page

Check name	Description	Status
A Sync	There's no description for the check yet, please add it to tests/ci/ci_config.py:CHECK_DESCRIPTIONS	⏳ pending
AST fuzzer	Runs randomly generated queries to catch program errors. The build type is optionally given in parenthesis. If it fails, ask a maintainer for help	❌ failure
CI running	A meta-check that indicates the running CI. Normally, it's in success or pending state. The failed status indicates some problems with the PR	⏳ pending
Mergeable Check	Checks if all other necessary checks are successful	❌ failure
Stress test	Runs stateless functional tests concurrently from several clients to detect concurrency-related errors	❌ failure

Successful checks

Check name	Description	Status
ClickBench	Runs [ClickBench](https://github.com/ClickHouse/ClickBench/) with instant-attach table	✅ success
ClickHouse build check	Builds ClickHouse in various configurations for use in further steps. You have to fix the builds that fail. Build logs often has enough information to fix the error, but you might have to reproduce the failure locally. The cmake options can be found in the build log, grepping for cmake. Use these options and follow the general build process	✅ success
Compatibility check	Checks that clickhouse binary runs on distributions with old libc versions. If it fails, ask a maintainer for help	✅ success
Docker keeper image	The check to build and optionally push the mentioned image to docker hub	✅ success
Docker server image	The check to build and optionally push the mentioned image to docker hub	✅ success
Docs check	Builds and tests the documentation	✅ success
Fast test	Normally this is the first check that is ran for a PR. It builds ClickHouse and runs most of stateless functional tests, omitting some. If it fails, further checks are not started until it is fixed. Look at the report to see which tests fail, then reproduce the failure locally as described here	✅ success
Flaky tests	Checks if new added or modified tests are flaky by running them repeatedly, in parallel, with more randomization. Functional tests are run 100 times with address sanitizer, and additional randomization of thread scheduling. Integrational tests are run up to 10 times. If at least once a new test has failed, or was too long, this check will be red. We don't allow flaky tests, read the doc	✅ success
Install packages	Checks that the built packages are installable in a clear environment	✅ success
Integration tests	The integration tests report. In parenthesis the package type is given, and in square brackets are the optional part/total tests	✅ success
PR Check	There's no description for the check yet, please add it to tests/ci/ci_config.py:CHECK_DESCRIPTIONS	✅ success
Performance Comparison	Measure changes in query performance. The performance test report is described in detail here. In square brackets are the optional part/total tests	✅ success
Stateful tests	Runs stateful functional tests for ClickHouse binaries built in various configurations -- release, debug, with sanitizers, etc	✅ success
Stateless tests	Runs stateless functional tests for ClickHouse binaries built in various configurations -- release, debug, with sanitizers, etc	✅ success
Style check	Runs a set of checks to keep the code style clean. If some of tests failed, see the related log from the report	✅ success
Unit tests	Runs the unit tests for different release types	✅ success
Upgrade check	Runs stress tests on server version from last release and then tries to upgrade it to the version from the PR. It checks if the new server can successfully startup without any errors, crashes or sanitizer asserts	✅ success

[rschu1ze]

I have updated the submodule contrib/libunwind to master, but there are still code conflicts, Do I need to rebase master to resolve the code conflicts?

I just merged from master, that resolves the issue.

@qiangxuhui Let's also avoid force-pushing once the code has been reviewed. A force-push allows to rewrite the entire commit history, meaning that all previously reviewed code (20k LOC in this PR) need to be re-reviewed.

[qiangxuhui]

I just merged from master, that resolves the issue.

@qiangxuhui Let's also avoid force-pushing once the code has been reviewed. A force-push allows to rewrite the entire commit history, meaning that all previously reviewed code (20k LOC in this PR) need to be re-reviewed.

@rschu1ze Thank you, I will follow your suggestions in future code push. What can I do next?

[rschu1ze]

Let's wait for results of CI builds/tests, if green we can merge this PR.

[qiangxuhui]

@rschu1ze AST fuzzer (debug) and Stress test (debug) failed, do I need to fix them?