RFR: JDK-8227021: VM fails if any sun.boot.library.path paths are longer than JVM_MAXPATHLEN

[Adam Farley8]

Hey All,

Reviewers and sponsors requested to inspect the following.

I've re-written the code change, as discussed with David Holes in emails 
last week, and now the webrev changes do this:

- Cause the VM to shut down with a relevant error message if one or more 
of the sun.boot.library.path paths is too long for the system.
- Apply similar error-producing code to the (legacy?) code in linker_md.c.
- Allow the numerical parameter for split_path to indicate anything we 
plan to add to the path once split, allowing for more accurate path length 
detection.
- Add an optional parameter to the os::split_path function that specifies 
where the paths came from, for a better error message.

Bug: https://bugs.openjdk.java.net/browse/JDK-8227021

New Webrev: http://cr.openjdk.java.net/~afarley/8227021.1/webrev/

Best Regards

Adam Farley 
IBM Runtimes

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