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Just working on some of the gmlt+fission debug info stuff and I came across a comment that might be relevant to reducing the number of distinct debugloc metadata nodes:

"or some sub-optimal metadata that

// isn't structurally identical (see: file path/name info from clang, which

// includes the directory of the cpp file being built, even when the file name

// is absolute (such as an <> lookup header)))"

Seems that the file path/name isn't well canonicalized so as to allow metadata level merging when linking. Might be helpful to figure out that issue at some point.

- David

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