Fix `--singlemethodname` (#78207)

Single method compilation mode broke with the change to use System.CommandLine. "Not specified" no longer means `null`.

diff --git a/src/coreclr/tools/aot/ILCompiler/Program.cs b/src/coreclr/tools/aot/ILCompiler/Program.cs
index 91c8a13..fa843ed 100644 (file)
--- a/src/coreclr/tools/aot/ILCompiler/Program.cs
+++ b/src/coreclr/tools/aot/ILCompiler/Program.cs
@@ -615,8 +615,7 @@ namespace ILCompiler
             if (method == null)
                 throw new CommandLineException($"Method '{singleMethodName}' not found in '{singleMethodTypeName}'");
 
-            if (method.HasInstantiation != (singleMethodGenericArgs != null) ||
-                (method.HasInstantiation && (method.Instantiation.Length != singleMethodGenericArgs.Length)))
+            if (method.Instantiation.Length != singleMethodGenericArgs.Length)
             {
                 throw new CommandLineException(
                     $"Expected {method.Instantiation.Length} generic arguments for method '{singleMethodName}' on type '{singleMethodTypeName}'");