[mono][interp] Stop trying to inflate signature

The target method and, implicitly, its signature are already inflated. This was allocating a new signature every time the method was called which was leaked. On some of the bigger tests suites, that heavily use generics, this can reduce the mem usage in the order of GBs.

Author: BrzVlad

src/mono/mono/mini/interp/transform.c

@@ -3214,10 +3214,14 @@ interp_constrained_box (TransformData *td, MonoClass *constrained_class, MonoMet
 static MonoMethod*
 interp_get_method (MonoMethod *method, guint32 token, MonoImage *image, MonoGenericContext *generic_context, MonoError *error)
 {
-	if (method->wrapper_type == MONO_WRAPPER_NONE)
+	if (method->wrapper_type == MONO_WRAPPER_NONE) {
 		return mono_get_method_checked (image, token, NULL, generic_context, error);
-	else
-		return (MonoMethod *)mono_method_get_wrapper_data (method, token);
+	} else {
+		MonoMethod *target_method = mono_method_get_wrapper_data (method, token);
+		if (generic_context)
+			target_method = mono_class_inflate_generic_method_checked (target_method, generic_context, error);
+		return target_method;
+	}
 }
 
 /*
@@ -3440,13 +3444,6 @@ interp_transform_call (TransformData *td, MonoMethod *method, MonoMethod *target
 			target_method = interp_get_method (method, token, image, generic_context, error);
 			return_val_if_nok (error, FALSE);
 			csignature = mono_method_signature_internal (target_method);
-
-			if (generic_context) {
-				csignature = mono_inflate_generic_signature (csignature, generic_context, error);
-				return_val_if_nok (error, FALSE);
-				target_method = mono_class_inflate_generic_method_checked (target_method, generic_context, error);
-				return_val_if_nok (error, FALSE);
-			}
 		}
 	} else {
 		csignature = mono_method_signature_internal (target_method);