[PATCH] Remove unused DiagnosticsEngine::NumErrorsSuppressed member

[Brad King]

Hi Folks,

While working on some DiagnosticsEngine code I noticed that the
NumErrorsSuppressed member has not been used since r119766.  Here
is a patch to drop it.  I've tested the patch on several versions
over the last few months, now through r220400.

Thanks,
-Brad

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