Aggregate CTAD of parenthesized prvalue fails

[JohelEGP]

See https://compiler-explorer.com/z/xjxWbKTs7.

template<class T> struct X { T x; };
auto x = X(0);

<source>:2:10: error: no viable constructor or deduction guide for deduction of template arguments of 'X'
    2 | auto x = X(0);
      |          ^
<source>:1:26: note: candidate template ignored: could not match 'X<T>' against 'int'
    1 | template<class T> struct X { T x; };
      |                          ^
<source>:1:26: note: candidate function template not viable: requires 0 arguments, but 1 was provided
1 error generated.
Compiler returned: 1

[llvmbot]

@llvm/issue-subscribers-clang-frontend

[cor3ntin]

@ayzhao @yuanfang-chen

[hokein]

The CTAD doesn't work for the functional-annotation explicit type conversion, e.g. A(1, 2):

template<typename X, typename Y> struct A { X x; Y y;};

void test() {
   A(1, 2); // clang fails
   new A(1, 2); // clang fails
}