Minor optimization for unified G1GC parsing #297
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Relative to issue #203
Additional minor optimization for G1GC parsing. Since the rule pattern matches what comes after the GC id in the log line, use the end position of the GC id to substring the log line. Basically, don't try to match the pattern where we know the match will fail.
The same optimization could not be used in the UnifiedGenerationalParser without having to re-engineer how that parser manages its forward reference.