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Commit 1b465767 authored by Florian Hahn's avatar Florian Hahn
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[TableGen] Make TreePatternNode::getChild return a reference (NFC) 

The return value of TreePatternNode::getChild is never null. This patch also
updates various places that use return values of getChild to also use
references. Those changes were suggested post-commit for D47463.

llvm-svn: 334764
parent c00e4465
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