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TableGen: Pattern<> references to null_frag are a nop.
A standalone pattern defined in a multiclass expansion should handle null_frag references just like patterns on instructions. Follow-up to r160333. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160384 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2908,6 +2908,11 @@ void CodeGenDAGPatterns::ParsePatterns() {
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for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
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Record *CurPattern = Patterns[i];
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DagInit *Tree = CurPattern->getValueAsDag("PatternToMatch");
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// If the pattern references the null_frag, there's nothing to do.
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if (hasNullFragReference(Tree))
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continue;
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TreePattern *Pattern = new TreePattern(CurPattern, Tree, true, *this);
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// Inline pattern fragments into it.
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