21136c0273
Inside an alias group, when ordering instruction aliases, we rely on the priority field to sort them. When the priority is not set or more generally when there is a tie between two aliases, we used to rely on the lexicographic order. However, this order can change for the anonymous records when more instruction, intrinsic, etc. are inserted. For instance, given two anonymous records r1 and r2 with respective name A_999 and A_1000, their lexicography order will be r2 then r1. Now, if an instruction is added before them, their name will become respectively A_1000 and A_1001, thus the lexicography order will be r1 then r2, i.e., it changed. If that happens in an alias group, the assembly output would prefer a different alias for no apparent good reasons. A way to fix that is to use proper priority for all aliases, but we can also make the tie breaker comparison smarter and use a deterministic ordering. This is what this patch does. llvm-svn: 294695
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