LSIF: unknown range errors

Created by: chrismwendt

• Visit https://sourcegraph.com/github.com/sourcegraph/sourcegraph/-/blob/cmd/searcher/search/search.go#L220
• Notice that defs/refs buttons do not appear
• Notice this error in the Network tab:

Error: Unknown range '395801'.
    at Object.mustGet (/lsif/out/util.js:36:11)
    at mapRangesToLocations (/lsif/out/database.js:516:68)
    at Database.convertRangesToLspLocations (/lsif/out/database.js:195:42)
    at Database.definitions (/lsif/out/database.js:68:35)
    at async /lsif/out/server.js:93:22

That LSIF dump was generated with lsif-go at commit e23ba48fe09fe0af26ab96dc8853f588aaafcca4

$ lsif-go version
Go LSIF exporter: 0.4.1
Protocol version: 0.4.0

Original discussion https://sourcegraph.slack.com/archives/CHXHX7XAS/p1568666728016800

Also noticed in https://sourcegraph.slack.com/archives/CHXHX7XAS/p1568674275022100