[PATCH] Driver: Include driver diags when we --serialize-diagnostics

[Justin Bogner]

Currently, when --serialize-diagnostics is passed this only includes the
diagnostics from clang -cc1, and driver diagnostics are dropped. This
causes issues for tools that use the serialized diagnostics, since
stderr is lost and these diagnostics aren't seen at all.

This patch handles this by merging the diagnostics from the CC1 process
and the driver diagnostics into a single file when the driver invokes
CC1.

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