spanify: Report begin/end collision case

This change is trivial and mechanical.

In `GetExprRange()`, this CL adds a little more detail to the case where
we expect an `Expr` to have the same `getBeginLoc()` and `getEndLoc()`.

Change-Id: I3166161afc5308cba3e080fd6c890bbbeb9bd804
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6827003
Reviewed-by: Yuki Shiino <[email protected]>
Commit-Queue: Kalvin Lee <[email protected]>
Reviewed-by: Stephen Nusko <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1498607}
NOKEYCHECK=True
GitOrigin-RevId: fafbb5486b8e0b7b5d1b85732844a57d9d2fc76f
1 file changed