RFR(XS) 8170431: non-ASCII characters in source code comments (jimage.hpp)

[David Buck]

Hi!

Please have a look at this small yet urgent fix to comments in a header 
file.

bug report: https://bugs.openjdk.java.net/browse/JDK-8170431
webrev: http://cr.openjdk.java.net/~dbuck/jdk8170431_0/

These changes are exactly the same as the changes made by Naoto to the 
class library's copy of jimage.hpp:

http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/cfa705d1f4e2

This is actually an important fix because VS will choke on this file 
under certain Windows locales (Chinese and Japanese have been reported 
so far). So the build is broken for many users without this fix.

Cheers,
-Buck