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LangRef: Add usage points for distinct MDNodes

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Omission pointed out by Sean Silva!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225479 91177308-0d34-0410-b5e6-96231b3b80d8
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Duncan P. N. Exon Smith 2015-01-08 23:50:26 +00:00
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@ -2854,6 +2854,10 @@ Metadata nodes that aren't uniqued use the ``distinct`` keyword. For example:
!0 = distinct !{!"test\00", i32 10}
``distinct`` nodes are useful when nodes shouldn't be merged based on their
content. They can also occur when transformations cause uniquing collisions
when metadata operands change.
A :ref:`named metadata <namedmetadatastructure>` is a collection of
metadata nodes, which can be looked up in the module symbol table. For
example: