[lld-macho,NFC] Switch to increasing priorities

--order_file, call graph profile, and BalancedPartitioning currently
build the section order vector by decreasing priority (from SIZE_MAX to
0). However, it's conventional to use an increasing key (see
OutputSection::inputOrder).

Switch to increasing priorities, remove the global variable
highestAvailablePriority, and remove the highestAvailablePriority
parameter from BPSectionOrderer. Change size_t to int.

This improves consistenty with the ELF and COFF ports. The ELF port
utilizes negative priorities for --symbol-ordering-file and call graph
profile, and non-negative priorities for --shuffle-sections (no Mach-O
counterpart yet).

Pull Request: https://github.com/llvm/llvm-project/pull/121727

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