RFR: 8062737: Sjavac creates unnecessarily many SjavacClient/PooledSjavac/SjavacImpl instances

[Andreas Lundblad]

Hi compiler-dev,

Please review this small fix for JDK-8062737.

Description: Sjavac (re)initializes 'sjavac' each compile iteration. This should be done once before entering the loop.

Link to bug report: https://bugs.openjdk.java.net/browse/JDK-8062737
Link to webrev:     http://cr.openjdk.java.net/~alundblad/8062737

Thanks,
Andreas