Enable trimming for crossgen2 publishing and fix symbol bug (#91135)

src/coreclr/tools/aot/crossgen2/crossgen2.csproj

@@ -7,8 +7,7 @@
     <!-- Can't use NativeAOT in source build yet https://github.com/dotnet/runtime/issues/66859 -->
     <NativeAotSupported Condition="'$(DotNetBuildFromSource)' == 'true'">false</NativeAotSupported>
     <NativeAotSupported Condition="$(OutputRID.StartsWith('tizen')) == 'true'">false</NativeAotSupported>
-    <!-- Trimming is not currently working, but set the appropriate feature flags for NativeAOT -->
-    <PublishTrimmed Condition="'$(NativeAotSupported)' == 'true'">true</PublishTrimmed>
+    <PublishTrimmed>true</PublishTrimmed>
     <RuntimeIdentifiers Condition="'$(_IsPublishing)' != 'true' and '$(DotNetBuildFromSource)' != 'true'">linux-x64;linux-musl-x64;linux-arm;linux-musl-arm;linux-arm64;linux-musl-arm64;freebsd-x64;freebsd-arm64;osx-x64;osx-arm64;win-x64;win-x86;win-arm64</RuntimeIdentifiers>
     <RuntimeIdentifiers Condition="'$(DotNetBuildFromSource)' == 'true'">$(PackageRID)</RuntimeIdentifiers>
     <SelfContained>false</SelfContained>
@@ -39,8 +38,8 @@
     <IlcFrameworkNativePath>$(MicrosoftNetCoreAppRuntimePackNativeDir)</IlcFrameworkNativePath>
     <TrimmerSingleWarn>false</TrimmerSingleWarn>
     <!-- Use .dwarf files instead of .dsym files since our symbol exporting may not safely handle folders. -->
-    <NativeSymbolExt>.dwarf</NativeSymbolExt>
-    <DsymUtilOptions>--flat</DsymUtilOptions>
+    <NativeSymbolExt Condition="'$(_IsApplePlatform)' == 'true'">.dwarf</NativeSymbolExt>
+    <DsymUtilOptions Condition="'$(_IsApplePlatform)' == 'true'">--flat</DsymUtilOptions>
   </PropertyGroup>
 
   <ItemGroup Condition="'$(NativeAotSupported)' == 'true'">