[driver] For the persistent bridging PCH job action, make sure to pass a serialized diagnostics path in the PCH output directory #10208
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Previously it was passing a relative filename and the invocation was creating .dia files in the source directory.
If a filename is not determined for inside the PCH output directory, it fallsback to creating a temporary for the diagnostics file,
similarly to the non-persistent bridging PCH job.
rdar://32594291