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Hsiangkai Wang 522b6db8c9 [DebugInfo] Do not generate address info for removed debug labels.
In some senario, LLVM will remove llvm.dbg.labels in IR. For example,
when the labels are in unreachable blocks, these labels will not
be generated in LLVM IR. In the case, these debug labels will have
address zero as their address. It is not legal address for debugger to
set breakpoints or query sources. So, the patch inhibits the address info
(DW_AT_low_pc) of removed labels.

Fix build failed in BuildBot, clang-stage1-cmake-RA-incremental, on macOS.

Differential Revision: https://reviews.llvm.org/D51908

llvm-svn: 343062
2018-09-26 04:19:23 +00:00
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