RFR (S): 8050114: Expose Integer/Long formatUnsigned methods internally

[Claes Redestad]

Hi,

  please review this patch to expose formatUnsignedInt/-Long through 
JavaLangAccess.

  webrev: http://cr.openjdk.java.net/~redestad/8050114/webrev.1/
  bug: https://bugs.openjdk.java.net/browse/JDK-8050114

  The behavior of the methods have been adjusted to be zero-padding in 
case the number formatted is shorter than the specified length, since 
that simplifies use cases for which this utility is exposed internally, 
e.g., JDK-8006627 <https://bugs.openjdk.java.net/browse/JDK-8006627>. 
Microbenchmarks show that this does not adversely affect performance of 
current uses through toHexString, toOctalString etc.

  Thanks!

  /Claes