The Microsoft.NETCore.App.Runtime.win-arm package ships x86 and ARM versions of crossgen.exe, which require the corresponding versions of the Microsoft.DiaSymReader.Native.*.dll library. While .NET Core 3.1 and .NET 5 releases contained three different architectures for the DiaSymReader library (x86, amd64, and arm), changes made in .NET 6 caused to ship only the architecture used for cross-compilation, i.e. x86. PR #49739 replaced it with the native architecture (arm), which fixed the native compilation scenario, but broke the cross-architecture compilation scenario.

This PR returns Microsoft.DiaSymReader.Native.x86.dll to the win-arm package; however, this time it is placed in the runtimes\x86_arm\native directory for cross-compilation libraries rather than the runtimes\win-arm\native directory for native libraries.

Below is the list of DiaSymReader library architectures shipped with different versions of the win-arm package. All package versions contain ARM-hosted crossgen.exe in the tools directory and x86-hosted crossgen.exe in the tools\x86_arm directory.

• v5.0.4 and earlier: x86, amd64, and arm (amd64 is not needed) in the runtimes\win-arm\native directory.
• v6.0.0-preview.1 and preview.2: x86 in the runtimes\win-arm\native directory.
• Unofficial v6.0.0-preview.3 builds after Update Microsoft.DiaSymReader.Native package #49739: arm in the runtimes\win-arm\native directory.
• With this PR: arm in the runtimes\win-arm\native directory and x86 in the runtimes\x86_arm\native directory.

Everything said above also applies to the win-arm64 package, which ships x64 and ARM64 versions of crossgen.exe. While .NET 5 releases contained three different architectures for the DiaSymReader library (x86, amd64, and arm, but no arm64), changes made in .NET 6 caused to ship only the architecture used for cross-compilation, i.e. amd64. PR #49739 replaced it with the native architecture (arm64), which fixed the native compilation scenario (together with the ceeload.h fix in this PR), but broke the cross-architecture compilation scenario.

This PR returns Microsoft.DiaSymReader.Native.amd64.dll to the win-arm64 package; however, this time it is placed in the runtimes\x64_arm64\native directory for cross-compilation libraries rather than the runtimes\win-arm64\native directory for native libraries.

Below is the list of DiaSymReader library architectures shipped with different versions of the win-arm64 package. All package versions contain ARM64-hosted crossgen.exe in the tools directory and x64-hosted crossgen.exe in the tools\x64_arm64 directory.

• v5.0.4 and earlier: x86, amd64, and arm (x86 is not needed) in the runtimes\win-arm64\native directory.
• v6.0.0-preview.1 and preview.2: amd64 in the runtimes\win-arm64\native directory.
• Unofficial v6.0.0-preview.3 builds after Update Microsoft.DiaSymReader.Native package #49739: arm64 in the runtimes\win-arm64\native directory.
• With this PR: arm64 in the runtimes\win-arm64\native directory and amd64 in the runtimes\x64_arm64\native directory.