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Refactor tree printing in AST dumping.
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Instead of manually maintaining a flag indicating whether we're about to print
out the last child of the parent node (to determine whether we print "`" or
"|"), capture a callable to print that child and defer printing it until we
either see a next child or finish the parent.

No functionality change intended.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@220930 91177308-0d34-0410-b5e6-96231b3b80d8
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@zygoloid
zygoloid committed Oct 30, 2014
1 parent 845eee3 commit 1f064ca
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