[llvm-branch-commits] [libcxx] release/18.x: [libcxx] [modules] Add _LIBCPP_USING_IF_EXISTS on aligned_alloc (#89827) (PR #89894)

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llvmbot wrote:

@mordante What do you think about merging this PR to the release branch?

https://github.com/llvm/llvm-project/pull/89894