HADOOP-18644. Add bswap support for LoongArch

[zhaixiaojuan]

Description of PR

This PR adds bswap support for LoongArch.

The LoongArch architecture (LoongArch) is an Instruction Set Architecture (ISA) that has a RISC style.
Documentations:
ISA:
https://loongson.github.io/LoongArch-Documentation/LoongArch-Vol1-EN.html
ABI:
https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html
More docs can be found at:
https://loongson.github.io/LoongArch-Documentation/README-EN.html

How was this patch tested?

building and verifying compilation worked.

For code changes:

• Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
• Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
• If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
• If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

[hadoop-yetus]

💔 -1 overall

Vote	Subsystem	Runtime	Logfile	Comment
+0 🆗	reexec	76m 6s		Docker mode activated.
			_ Prechecks _
+1 💚	dupname	0m 0s		No case conflicting files found.
+0 🆗	codespell	0m 0s		codespell was not available.
+0 🆗	detsecrets	0m 0s		detect-secrets was not available.
+1 💚	@author	0m 0s		The patch does not contain any @author tags.
-1 ❌	test4tests	0m 0s		The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch.
			_ trunk Compile Tests _
+1 💚	mvninstall	39m 56s		trunk passed
+1 💚	compile	0m 58s		trunk passed
+1 💚	mvnsite	0m 34s		trunk passed
+1 💚	shadedclient	60m 41s		branch has no errors when building and testing our client artifacts.
			_ Patch Compile Tests _
+1 💚	mvninstall	0m 22s		the patch passed
+1 💚	compile	0m 47s		the patch passed
+1 💚	cc	0m 47s		the patch passed
+1 💚	golang	0m 47s		the patch passed
+1 💚	javac	0m 47s		the patch passed
+1 💚	blanks	0m 0s		The patch has no blanks issues.
+1 💚	mvnsite	0m 22s		the patch passed
+1 💚	shadedclient	19m 4s		patch has no errors when building and testing our client artifacts.
			_ Other Tests _
+1 💚	unit	2m 53s		hadoop-mapreduce-client-nativetask in the patch passed.
+1 💚	asflicense	0m 40s		The patch does not generate ASF License warnings.
		162m 23s

Subsystem	Report/Notes
Docker	ClientAPI=1.42 ServerAPI=1.42 base: https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5453/1/artifact/out/Dockerfile
GITHUB PR	#5453
Optional Tests	dupname asflicense compile cc mvnsite javac unit codespell detsecrets golang
uname	Linux e0bf2ce9c8da 4.15.0-200-generic #211-Ubuntu SMP Thu Nov 24 18:16:04 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
Build tool	maven
Personality	dev-support/bin/hadoop.sh
git revision	trunk / 026cec3
Default Java	Red Hat, Inc.-1.8.0_362-b08
Test Results	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5453/1/testReport/
Max. process+thread count	559 (vs. ulimit of 5500)
modules	C: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask U: hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-nativetask
Console output	https://ci-hadoop.apache.org/job/hadoop-multibranch/job/PR-5453/1/console
versions	git=2.9.5 maven=3.6.3
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[Hexiaoqiao]

LGTM. +1 from my side.
@steveloughran would you mind to have another reviews. Thanks.

[steveloughran]

I'm not safe near native code; you will have to find someone else I'm afraid. Not done C/C++ this century

[Hexiaoqiao]

@iwasakims Would you mind to give another review? Thanks.

[Hexiaoqiao]

Committed to trunk considering this is compatible changes. Thanks @zhaixiaojuan for your contribution.