7197491: update copyright year to match last edit in jdk8 jdk repository
Reviewed-by: chegar, ksrini

7183053: Optimize DoubleByte charset for String.getBytes()/new String(byte[])
Summary: DoubleByte implements sun/nio.cs/ArrayDe/Encoder interface
Reviewed-by: alanb

6943119: Rebrand source copyright notices
Reviewed-by: darcy, weijun

6636323: Optimize handling of builtin charsets
6636319: Encoders should implement isLegalReplacement(byte[] repl)
Summary: optimized new String(byte[], cs/csn) and String.getBytes(cs/csn) for speed and memory consumption in singlebyte case.
Reviewed-by: alanb