This set of patches replaces the original Incremental LTO patch for stabilizing node order in lto partitions.
Main difference is earlier handling of node clone order, as suggested by Honza (https://gcc.gnu.org/pipermail/gcc-patches/2024-May/651593.html). Previously I simply set clone's order to zero during reorder, now they share order with their originating node since their creation. Bootstrapped/regtested on x86_64-linux
