[clang] [Clang][Parse] Diagnose requires expressions with explicit object parameters (PR #88974)

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+// RUN: %clang_cc1 -std=c++23 -fsyntax-only -verify %s
+
+auto x0 = requires (this int) { true; }; // expected-error {{a requires clause cannot have an explicit object parameter}}
+auto x1 = requires (int, this int) { true; }; // expected-error {{a requires clause cannot have an explicit object parameter}}
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cor3ntin wrote:

Can you add a test for `template <this auto> void f()` ?

https://github.com/llvm/llvm-project/pull/88974