Tomas Matheson a9e546cc71 [TableGen][NFC] convert TreePatternNode pointers to references (#81134) ...

Almost all uses of `*TreePatternNode` expect it to be non-null. There
was the occasional check that it wasn't, which I have removed. Making
them references makes it clear that they exist.

This was attempted in 2018 (1b465767d6)
for `TreePatternNode::getChild()` but that was reverted.

2024-02-09 13:35:42 +00:00

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