[llvm-branch-commits] [libcxx] [libc++] Add ABI flag to make __tree nodes more compact (PR #147681)

[Louis Dionne via llvm-branch-commits]

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@@ -98,6 +99,8 @@
 #  endif
 #endif
 
+#define _LIBCPP_ABI_TREE_POINTER_INT_PAIR
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ldionne wrote:

Let's add some documentation for this. Also (or only?) in the `.rst` docs?

https://github.com/llvm/llvm-project/pull/147681