[llvm-dev] A freshman has a problem：How to get the specific source line number in LR

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   Thank you very much for reading my emails in your busy schedule.   
   I get the ll file with debug information by using the command "clang++ xxx.c -g -S -emit-llvm -o xxx.ll".I want to get the line number information about the source code via "!DILocation". But I don't know how to use the API in PASS to get the Relevant metadata information.For example: (!24 !DILocation(line 32,column 5,scope: !11)
   I sincerely hope you can help me with this problem. Hope you are doing well and in good health.
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