RFR: 8005204: Provide more detailed output on CodeCache usage

[Vladimir Danushevsky]

Code review for JDK-8005204 "Provide more detailed output on CodeCache  
usage"

We are adding more detailed output on CodeCache usage.

Corresponding command line options are:
      -XX:+PrintCodeCache - Will print the size of the codecache at VM  
exit. It will include the total size, used size, maximum used size,  
maximum free chunk, bounds, number of cached methods , etc.
     -XX:+PrintCodeCacheOnCompilation - Same as PrintCodeCache, but  
does so each time a method is compiled. This is useful if the app does  
not do a normal JVM exit.

Sample output:

CodeCache: size=32768Kb used=542Kb max_used=542Kb free=32226Kb  
max_free_chunk=32226Kb
   bounds [0xb414a000, 0xb41d2000, 0xb614a000]
   total_blobs=131 nmethods=5 adapters=63
   compilation: enabled

Changeset: http://cr.openjdk.java.net/~vladidan/8005204/webrev.00/

Sponsoring Alexander Harlap for that submission