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a95d2979f9
Specifically, improved debug info retention in: * tryReplaceRedundantInstructionPair, * splitAggregateLoad, * TempLValueElimination, * Mem2Reg, * ConstantFolding. The changes to Mem2Reg allow debug info to be retained in the case tested by self-nostorage.swift in -O builds, so we have just enabled -O in that file instead of writing a new test for it. We attempted to add a case to salvageDebugInfo for unchecked_enum_data, but it caused crashes in Linux CI that we were not able to reproduce.