[libcxx-commits] [libcxx] [libc++] Remove UB from `std::__tree_node` and `std::__hash_node` construction (PR #153908)

[A. Jiang via libcxx-commits]

frederick-vs-ja wrote:

@vinay-deshmukh I modified the title and description to conclude the changes more clearly and associate this PR with the corresponding issue. Please double check the changes.

https://github.com/llvm/llvm-project/pull/153908