Moving the System.Runtime.Intrinsics.Arm namespace in box (#37656)

* Moving the System.Runtime.Intrinsics.Arm namespace in box

* Removing System.Runtime.Intrinsics.Experimental

src/libraries/System.Runtime.Intrinsics.Experimental/Directory.Build.props

-<Project>
-  <Import Project="..\Directory.Build.props" />
-  <PropertyGroup>
-    <StrongNameKeyId>Open</StrongNameKeyId>
-  </PropertyGroup>
-</Project>

src/libraries/System.Runtime.Intrinsics.Experimental/System.Runtime.Intrinsics.Experimental.sln

-Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27213.1
-MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Runtime.Intrinsics.Experimental", "src\System.Runtime.Intrinsics.Experimental.csproj", "{543FBFE5-E9E4-4631-8242-911A707FE818}"
-	ProjectSection(ProjectDependencies) = postProject
-		{4074AF8C-8C65-486C-960E-F45DAAB0BE0D} = {4074AF8C-8C65-486C-960E-F45DAAB0BE0D}
-	EndProjectSection
-EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Runtime.Intrinsics.Experimental", "ref\System.Runtime.Intrinsics.Experimental.csproj", "{4074AF8C-8C65-486C-960E-F45DAAB0BE0D}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{E107E9C1-E893-4E87-987E-04EF0DCEAEFD}"
-EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ref", "ref", "{2E666815-2EDB-464B-9DF6-380BF4789AD4}"
-EndProject
-Global
-	GlobalSection(SolutionConfigurationPlatforms) = preSolution
-		Debug|Any CPU = Debug|Any CPU
-		Release|Any CPU = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(ProjectConfigurationPlatforms) = postSolution
-		{543FBFE5-E9E4-4631-8242-911A707FE818}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{543FBFE5-E9E4-4631-8242-911A707FE818}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{543FBFE5-E9E4-4631-8242-911A707FE818}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{543FBFE5-E9E4-4631-8242-911A707FE818}.Release|Any CPU.Build.0 = Release|Any CPU
-		{4074AF8C-8C65-486C-960E-F45DAAB0BE0D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
-		{4074AF8C-8C65-486C-960E-F45DAAB0BE0D}.Debug|Any CPU.Build.0 = Debug|Any CPU
-		{4074AF8C-8C65-486C-960E-F45DAAB0BE0D}.Release|Any CPU.ActiveCfg = Release|Any CPU
-		{4074AF8C-8C65-486C-960E-F45DAAB0BE0D}.Release|Any CPU.Build.0 = Release|Any CPU
-	EndGlobalSection
-	GlobalSection(SolutionProperties) = preSolution
-		HideSolutionNode = FALSE
-	EndGlobalSection
-	GlobalSection(NestedProjects) = preSolution
-		{543FBFE5-E9E4-4631-8242-911A707FE818} = {E107E9C1-E893-4E87-987E-04EF0DCEAEFD}
-		{4074AF8C-8C65-486C-960E-F45DAAB0BE0D} = {2E666815-2EDB-464B-9DF6-380BF4789AD4}
-	EndGlobalSection
-	GlobalSection(ExtensibilityGlobals) = postSolution
-		SolutionGuid = {2E88FB02-CE53-4D6E-8D60-CDCD578E1871}
-	EndGlobalSection
-EndGlobal

src/libraries/System.Runtime.Intrinsics.Experimental/pkg/System.Runtime.Intrinsics.Experimental.pkgproj

-<Project DefaultTargets="Build">
-  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.props))" />
-  <ItemGroup>
-    <ProjectReference Include="..\ref\System.Runtime.Intrinsics.Experimental.csproj">
-      <SupportedFramework>net5.0</SupportedFramework>
-    </ProjectReference>
-    <ProjectReference Include="..\src\System.Runtime.Intrinsics.Experimental.csproj" />
-  </ItemGroup>
-  <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets))" />
-</Project>

src/libraries/System.Runtime.Intrinsics.Experimental/ref/System.Runtime.Intrinsics.Experimental.csproj

-<Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
-    <TargetFrameworks>$(NetCoreAppCurrent)</TargetFrameworks>
-    <Nullable>enable</Nullable>
-  </PropertyGroup>
-  <ItemGroup>
-    <Compile Include="System.Runtime.Intrinsics.Experimental.cs" />
-  </ItemGroup>
-  <ItemGroup>
-    <ProjectReference Include="..\..\System.Runtime\ref\System.Runtime.csproj" />
-    <ProjectReference Include="..\..\System.Runtime.Intrinsics\ref\System.Runtime.Intrinsics.csproj" />
-  </ItemGroup>
-</Project>

src/libraries/System.Runtime.Intrinsics.Experimental/src/System.Runtime.Intrinsics.Experimental.csproj

-<Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <AssemblyName>System.Runtime.Intrinsics.Experimental</AssemblyName>
-    <IsPartialFacadeAssembly>true</IsPartialFacadeAssembly>
-    <TargetFrameworks>$(NetCoreAppCurrent)-Windows_NT;$(NetCoreAppCurrent)-Unix</TargetFrameworks>
-    <Nullable>enable</Nullable>
-  </PropertyGroup>
-  <ItemGroup>
-    <ReferenceFromRuntime Include="System.Private.CoreLib" />
-  </ItemGroup>
-</Project>

src/libraries/pkg/baseline/packageIndex.json

@@ -5172,14 +5172,6 @@
         "net5.0": "5.0.0.0"
       }
     },
-    "System.Runtime.Intrinsics.Experimental": {
-      "BaselineVersion": "5.0.0",
-      "InboxOn": {},
-      "AssemblyVersionInPackageVersion": {
-        "4.0.0.0": "4.6.0",
-        "5.0.0.0": "5.0.0"
-      }
-    },
     "System.Runtime.Loader": {
       "StableVersions": [
         "4.0.0",

src/libraries/pkg/descriptions.json

@@ -1691,13 +1691,6 @@
       "System.IO.Path"
     ]
   },
-  {
-    "Name": "System.Runtime.Intrinsics.Experimental",
-    "Description": "Provides APIs for accessing processor specific instructions.",
-    "CommonTypes": [
-        "System.Runtime.Intrinsics.Arm.Arm64"
-    ]
-  },
   {
     "Name": "System.Runtime.Handles",
     "Description": "Provides base classes, including System.Runtime.InteropServices.CriticalHandle and System.Runtime.InteropServices.SafeHandle, for types that represent operating system handles.",