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When ingesting aranges from a dSYM, always trust the contents of the accelerator table since it always comes from dsymutil. According to Instruments, skipping the decoding of all CU DIEs to get at the DW_AT_ranges attribute removes ~3.5 seconds from setting a breakpoint by file/line when debugging clang with a dSYM. Interestingly on the wall clock the speedup is less noticeable, but still present. rdar://problem/56057688 Differential Revision: https://reviews.llvm.org/D68655