[ci-scan] Build break: NativeMemory not available in Microsoft.Bcl.Memory.Tests on net481 #131390

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1526281
Build error leg or test failing: windows-x64 Release Libraries_NET481 (Build product) - Microsoft.Bcl.Memory.Tests
Reproduced in follow-up build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1526936

Error Details

The Microsoft.Bcl.Memory.Tests project fails to compile for the net481 target because AllocationHelper.cs uses System.Runtime.InteropServices.NativeMemory, which is not available on .NET Framework (net481). This breaks the windows-x64 Release Libraries_NET481 leg on runtime-extra-platforms.

src\libraries\System.Memory\tests\AllocationHelper.cs(29,34): error CS0103: The name 'NativeMemory' does not exist in the current context [src\libraries\Microsoft.Bcl.Memory\tests\Microsoft.Bcl.Memory.Tests.csproj::TargetFramework=net481]
src\libraries\System.Memory\tests\AllocationHelper.cs(29,53): error CS0030: Cannot convert type 'System.IntPtr' to 'nuint' [Microsoft.Bcl.Memory.Tests.csproj::TargetFramework=net481]
src\libraries\System.Memory\tests\AllocationHelper.cs(51,17): error CS0103: The name 'NativeMemory' does not exist in the current context [Microsoft.Bcl.Memory.Tests.csproj::TargetFramework=net481]

Error Message

{
  "ErrorMessage": "AllocationHelper.cs(29,34): error CS0103: The name 'NativeMemory' does not exist in the current context",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

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