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Duncan P. N. Exon Smith c7c851bb04 IR: Update references to temporaries before deleting
During `MDNode::deleteTemporary()`, call `replaceAllUsesWith(nullptr)`
to update all tracking references to `nullptr`.

This fixes PR22280, where inverted destruction order between tracking
references and the temporaries themselves caused a use-after-free in
`LLParser`.

An alternative fix would be to add an assertion that there are no users,
and continue to fix inverted destruction order in clients (like
`LLParser`), but instead I decided to make getting-teardown-right easy.
(If someone disagrees let me know.)

llvm-svn: 226866
2015-01-22 21:36:45 +00:00
..
2014-11-06 15:05:51 +00:00
2014-06-27 18:19:56 +00:00
2014-12-09 05:56:09 +00:00
2015-01-14 22:27:36 +00:00