Arm AdvSimd: Rename LoadVector128xN to LoadNxVector128

[a74nh]

Partially fixes #102340

[ghost]

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[ghost]

Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

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[a74nh]

Manually confirmed HardwareIntrinsics_Arm_ro.dll tests still run for Load2xVector, Load3xVector, Load4xVector.

This is ready now. The mono parts haven't been tested as I don't know that code or how to test it, so needs a review from the mono team.

@kunalspathak @dotnet/arm64-contrib

[fanyang-mono]

The change to Mono looks good to me.

[kunalspathak]

coreclr changes LGTM. Thank you for doing this at short notice @a74nh!

[kunalspathak]

@fanyang-mono - which CI pipelines we should run to make sure that the code in the PR is getting tested for mono?

[fanyang-mono]

@kunalspathak There isn't a CI line currently could validate this change. I could run the tests locally.

[kunalspathak]

@kunalspathak There isn't a CI line currently could validate this change. I could run the tests locally.

sounds good. Please confirm here once you do that and I will go ahead and merge it.

[fanyang-mono]

Tests belonging to AdvSimd.Arm64_r.dll passed.

Supported ISAs:
  AdvSimd:   True
  Aes:       True
  ArmBase:   True
  Crc32:     True
  Dp:        False
  Rdm:       False
  Sha1:      True
  Sha256:    True
  Sve:       False
  
  ...
  
  Expected: 100
Actual: 100
END EXECUTION - PASSED

[kunalspathak]

/ba-g timeout issues