[clang] [Clang] Introduce a trait to determine the structure binding size (PR #131515)

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+// RUN: %clang_cc1 %s -std=c++2c -fsyntax-only -verify
+// RUN: %clang_cc1 %s -std=c++2c -fsyntax-only -verify -fexperimental-new-constant-interpreter
+
+
+struct S0 {};
+struct S1 {int a;};
+struct S2 {int a; int b;};
+struct S3 {double a; int b; int c;};
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cor3ntin wrote:

I added tests for all of these

https://github.com/llvm/llvm-project/pull/131515