D8857: work around clang bug 35333: don't crash when switching git branches

[Sven Brauch]

brauch created this revision.
brauch added reviewers: KDevelop, kfunk, mwolff.
Restricted Application added a subscriber: kdevelop-devel.

REVISION SUMMARY
  See https://bugs.llvm.org/show_bug.cgi?id=35333 for details and 
  explanation.
  
  We need to do two things to work around this bug: disable -Wdocumentation,
  and only use the plain text from the comments instead of the parsed
  version.

TEST PLAN
  Open a project in kdev, and while it's parsing run "git checkout A; sleep 1; git checkout B; sleep 1;" in a loop. Without this patch, it will crash after at most 10-15 iterations here.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D8857

AFFECTED FILES
  plugins/clang/duchain/builder.cpp
  plugins/clang/duchain/parsesession.cpp

To: brauch, #kdevelop, kfunk, mwolff
Cc: kdevelop-devel
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