RFR [9]: 8050142: Optimize java.util.Formatter

[Claes Redestad]

Hi,

  please review this patch which optimizes away some allocations from 
java.util.Formatter and achieve 1.1-1.3x speedups of micros targetting 
String.format. See bug for more details.

  webrev: http://cr.openjdk.java.net/~redestad/8050142/webrev.0
  bug: https://bugs.openjdk.java.net/browse/JDK-8050142

  Testing: JPRT, jtreg (java/lang/String, java/util/Formatter), 
SPECjbb2013 and microbenchmarks

  Thanks!

  /Claes