Optimize EolAwareOutputStream for bulk output

Optimize EolAwareOutputStream for bulk output

Formatting merge conflicts one byte at a time is going to be very
slow when the final OutputStream is a FileOutputStream and the JVM
is making system calls for each byte output.

When outputting a range of bytes from a byte[] the bol (beginning
of line) value only depends on the value of the last byte written.
Other bytes in the array can be passed directly to the lower stream
for more efficient output.

Change-Id: I3415f9a390ee215210a17bb5bf39164d197e1348