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Update AnalysisGroup documentation to document restriction that allows
only one ImmutablePass in a group. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37675 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1308,8 +1308,9 @@ no problem.</p>
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<p>Here we show how the default implementation is specified (using the extra
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argument to the <tt>RegisterAnalysisGroup</tt> template). There must be exactly
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one default implementation available at all times for an Analysis Group to be
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used. Here we declare that the <tt><a
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href="http://llvm.org/doxygen/structBasicAliasAnalysis.html">BasicAliasAnalysis</a></tt>
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used. Only default implementation can derive from <tt>ImmutablePass</tt>.
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Here we declare that the
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<tt><a href="http://llvm.org/doxygen/structBasicAliasAnalysis.html">BasicAliasAnalysis</a></tt>
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pass is the default implementation for the interface.</p>
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</div>
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