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[DynInst_API:] [dyninst/dyninst] 69f6ac: fix dwarf parallel parsing

Date: Tue, 08 Mar 2022 11:44:31 -0800
From: kupsch <noreply@xxxxxxxxxx>
Subject: [DynInst_API:] [dyninst/dyninst] 69f6ac: fix dwarf parallel parsing 
  Branch: refs/heads/kupsch/fix-dwarf-parallel-parsing
  Home:   https://github.com/dyninst/dyninst
  Commit: 69f6acc36de472f152758d99ad78ed50d30051f7
      https://github.com/dyninst/dyninst/commit/69f6acc36de472f152758d99ad78ed50d30051f7
  Author: James A. Kupsch <kupsch@xxxxxxxxxxx>
  Date:   2022-03-08 (Tue, 08 Mar 2022)

  Changed paths:
    M symtabAPI/src/dwarfWalker.C
    M symtabAPI/src/dwarfWalker.h

  Log Message:
  -----------
  fix dwarf parallel parsing

Fix to only process the DWARF for a function (subprogram) once if it is defined
in multiple compilation units within a library or executable.  This prevents
duplication of parameters, local variables and use of thread-unsafe data
structures from concurrent threads.
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