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

6642328: Speeding up Single Byte Encoders
Summary: re-implementation of mapping based sbcs charts
Reviewed-by: alanb