Doug Gregor 720429daf4 [Constraint solver] Disable fallback diagnostic when error emitted into a transaction ...

When we are using diagnostic transactions to disable immediate emission
of diagnostics, `DiagnosticEngine::hadAnyError()` no longer accurately
reports whether an error occurred. Thread the DiagnosticTransaction
into the ConstraintSystem so we can also check whether it contains an
error before emitting the fallback diagnostic.

Fixes rdar://128272346.

2024-11-06 17:07:13 -08:00

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