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Author SHA1 Message Date
Duncan P. N. Exon Smith
ee40b16641 Reapply "Linker: Drop superseded subprograms" 
This reverts commit r224416, reapplying r224389.  The buildbots hadn't
recovered after my revert, waiting until David reverted a couple of his
commits.  It looks like it was just bad timing (where we were both
modifying code related to the same assertion).  Trying again...

Here's the original text:

    When a function gets replaced by `ModuleLinker`, drop superseded
    subprograms.  This ensures that the "first" subprogram pointing at a
    function is the same one that `!dbg` references point at.

    This is a stop-gap fix for PR21910.  Notably, this fixes Release+Asserts
    bootstraps that are currently asserting out in
    `LexicalScopes::initialize()` due to the explicit instantiations in
    `lib/IR/Dominators.cpp` eventually getting replaced by -argpromotion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224487 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-12-18 01:05:33 +00:00
Duncan P. N. Exon Smith
80c5783c88 Revert "Linker: Drop superseded subprograms" 
This reverts commit r224389.  Based on feedback from the bots, the
assertion seems to be going off *more* often, not less (previously I was
just seeing it in an internal bootstrap, now it's happening in public
builds too).

http://lab.llvm.org:8080/green/job/clang-stage2-configure-Rlto_build/936/
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap/builds/5325

Reverting in order to investigate.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224416 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-12-17 07:27:31 +00:00
Duncan P. N. Exon Smith
d4017d0489 Linker: Drop superseded subprograms 
When a function gets replaced by `ModuleLinker`, drop superseded
subprograms.  This ensures that the "first" subprogram pointing at a
function is the same one that `!dbg` references point at.

This is a stop-gap fix for PR21910.  Notably, this fixes Release+Asserts
bootstraps that are currently asserting out in
`LexicalScopes::initialize()` due to the explicit instantiations in
`lib/IR/Dominators.cpp` eventually getting replaced by -argpromotion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224389 91177308-0d34-0410-b5e6-96231b3b80d8
 2014-12-16 23:23:41 +00:00