Create 2022-08-12-cross-thread-flow.md

Author: smowton

go/ql/lib/change-notes/2022-08-12-cross-thread-flow.md

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+---
+category: minorAnalysis
+---
+* Fixed data-flow to captured variable references.
+* We now assume that if a channel-typed field is only referred to twice in the user codebase, once in a send operation and once in a receive, then data flows from the send to the receive statement. This enables finding some cross-goroutine flow.