RFR(XS) 8230168 Use ClasspathStream for FileMapInfo::create_path_array

[Ioi Lam]

https://bugs.openjdk.java.net/browse/JDK-8230168
http://cr.openjdk.java.net/~iklam/jdk14/8230168-classpath-stream-for-filemap-cpp.v01/


Just a follow-up to JDK-8230011 [1]
There's similarly duplicated in filemap.cpp that can be replaced by 
ClasspathStream

Thanks
- Ioi


[1] https://bugs.openjdk.java.net/browse/JDK-8230011