Add ARM64 msdia140.dll support to test platform packages

[jamesmcroft]

Adds ARM64 support for msdia140.dll across the test platform packaging, enabling ARM64 test hosts to use the DIA SDK for symbol resolution and crash dump analysis (#15327)

Changes

File	Change
eng/Versions.props	Bump TestPlatformMSDiaVersion to 18.7.0-preview-1-11715-406
TestHost.csproj	Add DiaFilesArm64 item group + copy in CopyDiaFiles target
TestHost.nuspec	Add arm64/msdia140.dll to lib/net8.0/arm64/
CLI.nuspec	Add arm64/msdia140.dll + manifest to TestHostNetFramework/arm64/

Context

The Microsoft.Internal.Dia package version 18.7.0-preview-1-11715-406 now includes ARM64 binaries alongside existing x86 and x64. The test platform packaging only referenced x86 and x64 — this PR wires ARM64 through the build and nuspec layout.

Validation

• ARM64 DLL confirmed present in the updated package (tools/net451/arm64/msdia140.dll)
• PDB resolves on the Microsoft public symbol server for all three architectures (x86, x64, arm64) via dotnet-symbol
• CLI.csproj already uses wildcard globs (**/*) for Dia file copy — no change needed there

[jamesmcroft]

cc @nohwnd

[nohwnd]

fails with: Verify-Nuget-Packages : There are 2 errors:
Number of files are not equal for 'Microsoft.TestPlatform.CLI.18.7.0-ci', expected: 483 actual: 485
Number of files are not equal for 'Microsoft.TestPlatform.TestHost.18.7.0-ci', expected: 64 actual: 65

You need to bump up the numbers in verify-nupkgs script. and ideally tell me what the added files are exactly.

I would also check microsoft.testplatform package, portable package, and cli.v2, those should be all the tools packages, not sure if we ship the dlls in all.

[nohwnd]

yeah looks like we have it in all the folders that I listed,

https://grep.app/search?f.lang=XML&f.path=src%2F&f.repo=microsoft%2Fvstest&f.repo.pattern=vstest&regexp=true&q=diasym%7Cmsdia

[jamesmcroft]

Updated with the additional packages and verify-nupkgs counts. Here's the breakdown of what was added and where:

Files added by Microsoft.Internal.Dia 18.7.0-preview-1-11715-406

The updated package includes a new tools/net451/arm64/ folder containing:

• msdia140.dll
• msdia140.dll.manifest

Where ARM64 entries were added

Package	File	Change
TestHost.csproj	CopyDiaFiles target	Added DiaFilesArm64 item group + copy to arm64
TestHost.nuspec	lib/net8.0/arm64/	Added msdia140.dll
CLI.nuspec	contentFiles/any/net10.0/TestHostNetFramework/arm64/	Added msdia140.dll + .manifest
Portable.nuspec	tools/net8.0/TestHostNetFramework/arm64/	Added msdia140.dll + .manifest
V2.CLI.csproj	VSIX VsixSourceItem	Added arm64\* with VSIXSubPath=arm64

verify-nupkgs.ps1 count updates

Package	Before	After	Delta
TestHost	64	65	+1 (arm64 dll)
CLI	483	485	+2 (arm64 dll + manifest)
Portable	609	611	+2 (arm64 dll + manifest)
V2.CLI	388	390	+2 (arm64 dll + manifest)

Verified locally: build succeeded, pack succeeded, all file counts match.

[nohwnd]

still missing microsoft.testplatform if I am looking correctly. https://github.com/microsoft/vstest/blob/main/src/package/Microsoft.TestPlatform/Microsoft.TestPlatform.nuspec

[nohwnd]

Pushed a fix to add ARM64 msdia140.dll entries to Microsoft.TestPlatform.nuspec — it was the only nuspec still missing arm64.

Changes:

• Added arm64/msdia140.dll + .manifest to all 3 msdia groups in Microsoft.TestPlatform.nuspec (TestImpact/ComComponents, V1/TestImpact/ComComponents, and TestPlatform root)
• Updated verify-nupkgs.ps1 count for Microsoft.TestPlatform: 545 → 551 (+6 files)

The .csproj already uses a **\* wildcard glob for Dia files so the build copies arm64 automatically — only the nuspec needed explicit entries.