[C++20] [Modules] [ABI] The linkage of in-class defaulted function

[ChuanqiXu9]

e.g.,

export module a;
export class A {
public:
  A() = default;
  ~A() = default;
};

I believe we should generate A::A() and A::~A() in current TU instead of treating them as inline now.

godbolt: https://godbolt.org/z/MGn5sE1sb we should be able to see A::A() and A::~A() here.

[llvmbot]

@llvm/issue-subscribers-clang-modules

Author: Chuanqi Xu (ChuanqiXu9)

e.g.,

export module a;
export class A {
public:
  A() = default;
  ~A() = default;
};

I believe we should generate A::A() and A::~A() in current TU instead of treating them as inline now.