Do not generate broken debug info for non-methods (#94693)

The related methods (`EmitDebugInfo`, `EmitEHClauseInfo`) already do this - if the node is not a method node, don't emit anything. It is not clear what purpose the "if this is not a method, emit broken debug information" serves. I traced it all the way back to https://github.com/dotnet/corert/blob/d78cf62480331f63b26eb08b86b838ffa355ff0d/src/ILCompiler.Compiler/src/Compiler/DependencyAnalysis/ObjectWriter.cs#L427-L447 - it was surrounded by TODOs so maybe it didn't fully stand out but it doesn't look right there already.

Author: MichalStrehovsky

src/coreclr/tools/aot/ILCompiler.Compiler/Compiler/DependencyAnalysis/ObjectWriter.cs

@@ -439,15 +439,11 @@ public void EmitDebugEHClauseInfo(ObjectNode node)
         private static extern void EmitDebugFunctionInfo(IntPtr objWriter, byte[] methodName, int methodSize, uint methodTypeIndex);
         public void EmitDebugFunctionInfo(ObjectNode node, int methodSize)
         {
-            uint methodTypeIndex = 0;
-
-            var methodNode = node as IMethodNode;
-            if (methodNode != null)
+            if (node is IMethodNode methodNode)
             {
-                methodTypeIndex = _userDefinedTypeDescriptor.GetMethodFunctionIdTypeIndex(methodNode.Method);
+                uint methodTypeIndex = _userDefinedTypeDescriptor.GetMethodFunctionIdTypeIndex(methodNode.Method);
+                EmitDebugFunctionInfo(_nativeObjectWriter, _currentNodeZeroTerminatedName.UnderlyingArray, methodSize, methodTypeIndex);
             }
-
-            EmitDebugFunctionInfo(_nativeObjectWriter, _currentNodeZeroTerminatedName.UnderlyingArray, methodSize, methodTypeIndex);
         }
 
         [DllImport(NativeObjectWriterFileName)]