RFR (S) 8227370 Remove SharedPathsMiscInfo

[Ioi Lam]

https://bugs.openjdk.java.net/browse/JDK-8227370
http://cr.openjdk.java.net/~iklam/jdk14/8227370_remove_shared_misc_info.v01/

For the 3 types of items stored in SharedPathsMiscInfo

BOOT_PATH/APP_PATH:

These are used only for tracing. I reimplemented the tracing
functionality in FileMapInfo::log_paths()

NON_EXIST:

It turns out we don't need to keep track of non-existent paths from the
dump-time path.  We can simply eliminate all the non-existent paths from
both the dump-time and runtime paths, and check that the remaining files
match. E.g.,

dump: -cp a.jar:NE1:NE2:b.jar
run 1: -cp NE3:a.jar:NE4:b.jar
run 2: -cp x.jar:NE4:b.jar

after elimination:

dump = a.jar:b.jar
run 1 = a.jar:b.jar -> matched
run 2 = x.jar:b.jar -> mismatched

The dump-time elimination was already done in 
ClassLoader::update_class_path_entry_list().
The run-time elimination was already done in 
FileMapInfo::create_path_array().

So essentially I just tied things together and wrote a few more test cases
in NonExistClasspath.java


Testing: hs-tier{1,2,3}