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PrevSection/PrevCU are used to detect holes in the address range of a CU to ensure the DW_AT_ranges does not include those holes. When we see a function with no debug info, though it may be in the same range as the prior and subsequent functions, there should be a gap in the CU's ranges. By setting PrevCU to null in that case, the range would not be extended to cover the gap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217466 91177308-0d34-0410-b5e6-96231b3b80d8
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