Jan Svoboda 2935737da3 [clang][tooling] Create SourceManager for DiagnosticsEngine before command-line parsing ...

In D84673, we started using `DiagnosticsEngine` during command-line parsing in more contexts.

When using `ToolInvocation`, a custom `DiagnosticsConsumer` can be specified and it might expect `SourceManager` to be present on the emitted diagnostics.

This patch ensures the `SourceManager` is set up in such scenarios.

Test authored by Jordan Rupprecht.

Reviewed By: rupprecht

Differential Revision: https://reviews.llvm.org/D99414

2021-04-06 10:40:47 +02:00

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