Changed the CompilerIdentifier label from the previous hardcoded mess…

…age to programmatically retrieve the current version. (dotnet#51352)

src/coreclr/tools/aot/ILCompiler.ReadyToRun/Compiler/DependencyAnalysis/ReadyToRun/CompilerIdentifierNode.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using System.Reflection;
 using System.Text;
 using Internal.Text;
 using Internal.TypeSystem;
@@ -9,8 +10,6 @@ namespace ILCompiler.DependencyAnalysis.ReadyToRun
 {
     internal class CompilerIdentifierNode : HeaderTableNode
     {
-        private static readonly string _compilerIdentifier = "CoreRT Ready-To-Run Compiler";
-
         public override ObjectNodeSection Section => ObjectNodeSection.ReadOnlyDataSection;
 
         public override int ClassCode => 230053202;
@@ -25,12 +24,21 @@ public override void AppendMangledName(NameMangler nameMangler, Utf8StringBuilde
             sb.Append("__ReadyToRunHeader_CompilerIdentifier");
         }
 
+        private string GetCompilerVersion()
+        {
+            return Assembly
+                   .GetExecutingAssembly()
+                   .GetCustomAttribute<AssemblyFileVersionAttribute>()
+                   .Version;
+        }
+
         public override ObjectData GetData(NodeFactory factory, bool relocsOnly = false)
         {
             ObjectDataBuilder builder = new ObjectDataBuilder(factory, relocsOnly);
+            string compilerIdentifier = $"Crossgen2 {GetCompilerVersion()}";
             builder.RequireInitialPointerAlignment();
             builder.AddSymbol(this);
-            builder.EmitBytes(Encoding.ASCII.GetBytes(_compilerIdentifier));
+            builder.EmitBytes(Encoding.ASCII.GetBytes(compilerIdentifier));
             return builder.ToObjectData();
         }
     }