[11] RFR: JDK-8202582 : DateTimeFormatterBuilder.parseOffsetBased unnecessarily calls toString()

[Rachna Goel]

Hi,

Kindly review this small patch for JDK-8202582.
https://bugs.openjdk.java.net/browse/JDK-8202582

http://cr.openjdk.java.net/~rgoel/JDK-8202582/webrev/

Fix is to call text.subSequence() before calling toString() on input 
string, for more performance.

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Thanks,
Rachna