Remove ILCompiler package reference (dotnet#107583)

It doesn't look like we need the newest version of the package
anymore. This configuration (using the package instead of the SDK version)
can be dangerous because it causes a split between the version built
against vs. the version AOT'd against.

eng/Version.Details.xml

@@ -304,10 +304,6 @@
       <Sha>7cb32e193a55a95c74fc3bd56501b951b48b700f</Sha>
       <SourceBuild RepoName="runtime" ManagedOnly="false" />
     </Dependency>
-    <Dependency Name="Microsoft.DotNet.ILCompiler" Version="9.0.0-rc.1.24410.5">
-      <Uri>https://github.com/dotnet/runtime</Uri>
-      <Sha>7cb32e193a55a95c74fc3bd56501b951b48b700f</Sha>
-    </Dependency>
     <Dependency Name="System.Reflection.Metadata" Version="9.0.0-rc.1.24410.5">
       <Uri>https://github.com/dotnet/runtime</Uri>
       <Sha>7cb32e193a55a95c74fc3bd56501b951b48b700f</Sha>

eng/Versions.props

@@ -212,8 +212,6 @@
     <MicrosoftPrivateIntellisenseVersion>8.0.0-preview-20230918.1</MicrosoftPrivateIntellisenseVersion>
     <!-- Mono Cecil -->
     <MicrosoftDotNetCecilVersion>0.11.5-alpha.24460.1</MicrosoftDotNetCecilVersion>
-    <!-- ILCompiler -->
-    <MicrosoftDotNetILCompilerVersion>9.0.0-rc.1.24410.5</MicrosoftDotNetILCompilerVersion>
     <!-- ICU -->
     <MicrosoftNETCoreRuntimeICUTransportVersion>10.0.0-alpha.1.24459.2</MicrosoftNETCoreRuntimeICUTransportVersion>
     <!-- MsQuic -->

eng/liveBuilds.targets

@@ -58,6 +58,15 @@
     <SingleFileHostSourcePath>$([MSBuild]::NormalizePath('$(CoreCLRArtifactsPath)', 'corehost', 'singlefilehost$(ExeSuffix)'))</SingleFileHostSourcePath>
   </PropertyGroup>
 
+  <!-- Not a live build, but allow overriding the LKG ILCompiler package with a specific version. -->
+  <PropertyGroup Condition="'$(UseNativeAotForComponents)' == 'true' and '$(PublishAot)' == 'true' and '$(MicrosoftDotNetILCompilerVersion)' != ''">
+    <SuppressGenerateILCompilerExplicitPackageReferenceWarning>true</SuppressGenerateILCompilerExplicitPackageReferenceWarning>
+  </PropertyGroup>
+  <ItemGroup Condition="'$(UseNativeAotForComponents)' == 'true' and '$(PublishAot)' == 'true' and '$(MicrosoftDotNetILCompilerVersion)' != ''">
+    <PackageReference Include="Microsoft.DotNet.ILCompiler" Version="$(MicrosoftDotNetILCompilerVersion)" />
+    <PackageReference Include="runtime.$(ToolsRID).Microsoft.DotNet.ILCompiler" Version="$(MicrosoftDotNetILCompilerVersion)" />
+  </ItemGroup>
+
   <Target Name="ResolveRuntimeFilesFromLocalBuild">
     <Error Condition="!Exists('$(CoreCLRArtifactsPath)') and '$(RuntimeFlavor)' == 'CoreCLR'"
            Text="The CoreCLR artifacts path does not exist '$(CoreCLRArtifactsPath)'. The 'clr' subset must be built before building this project. Configuration: '$(CoreCLRConfiguration)'. To use a different configuration, specify the 'RuntimeConfiguration' property." />

src/coreclr/tools/aot/ILCompiler/ILCompiler.csproj

@@ -15,14 +15,8 @@
     <PublishReadyToRun Condition="'$(UseNativeAotForComponents)' != 'true'">true</PublishReadyToRun>
     <PublishSingleFile Condition="'$(UseNativeAotForComponents)' != 'true'">true</PublishSingleFile>
     <PublishTrimmed Condition="'$(UseNativeAotForComponents)' != 'true'">true</PublishTrimmed>
-    <SuppressGenerateILCompilerExplicitPackageReferenceWarning>true</SuppressGenerateILCompilerExplicitPackageReferenceWarning>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(UseNativeAotForComponents)' == 'true'">
-    <PackageReference Include="Microsoft.DotNet.ILCompiler" Version="$(MicrosoftDotNetILCompilerVersion)" />
-    <PackageReference Include="runtime.$(ToolsRID).Microsoft.DotNet.ILCompiler" Version="$(MicrosoftDotNetILCompilerVersion)" />
-  </ItemGroup>
-
   <!-- Needed for the amd64 -> amd64 musl cross-build to pass the target flag. -->
   <Target Name="_FixIlcTargetTriple"
           AfterTargets="SetupOSSpecificProps"

src/native/managed/native-library.props

@@ -6,7 +6,6 @@
          the same way as eng/native/functions.cmake strip_symbols
     -->
     <StripSymbols>false</StripSymbols>
-    <SuppressGenerateILCompilerExplicitPackageReferenceWarning>true</SuppressGenerateILCompilerExplicitPackageReferenceWarning>
     <ControlFlowGuard>Guard</ControlFlowGuard>
   </PropertyGroup>
 
@@ -34,9 +33,4 @@
     <!-- passed by compile-native.proj to set - -gcc-toolchain=$(ROOTFS_DIR)/usr -->
     <CustomLinkerArg Condition="'$(CustomLinkerArgToolchainArg)' != ''" Include="$(CustomLinkerArgToolchainArg)" />
   </ItemGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.DotNet.ILCompiler" Version="$(MicrosoftDotNetILCompilerVersion)" />
-    <PackageReference Include="runtime.$(ToolsRID).Microsoft.DotNet.ILCompiler" Version="$(MicrosoftDotNetILCompilerVersion)" />
-  </ItemGroup>
 </Project>