[clang] [Clang] Rebuild lambda captures in default member initializers while skipping body (PR #196597)

[Alexander Kornienko via cfe-commits]

alexfh wrote:

@yuxuanchen1997 could you take a look at the clang crash report above (https://github.com/llvm/llvm-project/pull/196597#issuecomment-4997866573)? Please fix or revert this soon.

I've reduced the test case a bit more: https://godbolt.org/z/79fW6resP

```
struct A {
  A();
  A(const A&);
  A &operator=(const A&);
};

template<typename T>
int F(const T& fn) { return 0; }

struct {
  A a;
  int n = F([q = a] {});
} s = {};
```

https://github.com/llvm/llvm-project/pull/196597