dexonsmith added a comment.
https://github.com/llvm/llvm-project/blob/master/llvm/lib/IR/Metadata.cpp#L716
is where the auto-detection of self-references is:
// Drop uniquing for self-reference cycles and deleted constants.
if (New == this || (!New && Old && isa<ConstantAsMetadata>(Old))) {
if (!isResolved())
resolve();
storeDistinctInContext();
return;
}
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D90079/new/
https://reviews.llvm.org/D90079
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