[clang] [Clang] Preserve CXXParenListInitExpr in TreeTransform. (PR #138518)

[Alexander Kornienko via cfe-commits]

alexfh wrote:

@cor3ntin yep, the second test case I have doesn't seem to be directly related. It causes crashes to Clang since version 7: https://gcc.godbolt.org/z/6M13c4q3T

https://github.com/llvm/llvm-project/pull/138518