[patch] Check for isDiagnosticEnabled even if we have a dig handler

[Rafael Espíndola]

Currently if there is a diagnostic handler it gets passed every
remark. This means that the gold plugin can only choose to print all
or none of them.

This patch move the check for isDiagnosticEnabled earlier which lets
the gold plugin handle things like -pass-remarks=inline.

Cheers,
Rafael
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