[DebugInfo][InstCombine] Do not overwrite prior DILocation for new Insts (#108565) When InstCombine replaces an old instruction with a new instruction, it copies !dbg and !annotation metadata from old to new. For some InstCombine patterns we set a specific DILocation on the new instruction prior to insertion, however, which more accurately reflects the new instruction. This more specific DILocation may be overwritten on insertion by a less appropriate one, resulting in a less correct line mapping. This patch changes this behaviour to only copy the DILocation from old to new if the new instruction has no existing DILocation (which will always be the case for a new instruction unless InstCombine has specifically set one).
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