[clang] [clang][Interp] Only emit function_param_value_unknown in C++11 (PR #67990)

[Aaron Ballman via cfe-commits]

================
@@ -1,5 +1,5 @@
 // RUN: %clang_cc1 -triple x86_64-apple-darwin10.0.0 -fsyntax-only -verify %s -Winvalid-offsetof -std=c++98
-// RUN: %clang_cc1 -triple x86_64-apple-darwin10.0.0 -fsyntax-only -verify=expected,new-interp %s -Winvalid-offsetof -std=c++98 -fexperimental-new-constant-interpreter
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10.0.0 -fsyntax-only -verify=expected %s -Winvalid-offsetof -std=c++98 -fexperimental-new-constant-interpreter
----------------
AaronBallman wrote:

```suggestion
// RUN: %clang_cc1 -triple x86_64-apple-darwin10.0.0 -fsyntax-only -verify %s -Winvalid-offsetof -std=c++98 -fexperimental-new-constant-interpreter
```

https://github.com/llvm/llvm-project/pull/67990