Give a reason to any-scrubbed "open unresolved" speculation tvars
Give a reason to any-scrubbed "open unresolved" speculation tvars

Summary:
Changes in the stacked diff cause this reason to appear in error output. I'm
not sure what the mechanism is, but this is a sensible reason to give the type,
so we might as well.

Reviewed By: gabelevi

Differential Revision: D6456033

fbshipit-source-id: c226713588d75aafe94eb5c5212f86e45ded3907

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