RFR (4th): 8023524: Mechanism to dump generated lambda classes / log lambda code generation

[Henry Jen]

Hi,

Please review the updated webrev at
http://cr.openjdk.java.net/~henryjen/ccc/8023524/3/webrev/

This update addressed comments from Mandy with following,

- call doPrivileged with specific file permission, "<<ALL FILES>>", "write".
- Use nio package to write deal with FS, also create directory hierarchy
with package name instead of flat files.
- If not specify a value or empty string, the directory is default to
current working directory as "." is specified.

We continue to use local encoding rule as other suggestions doesn't fit.
The reason we cannot use something like URLEncoder is that ":" won't get
encoded and it's not valid character for filename on Windows. All the
suggestions so far seems to have that same issue.

Cheers,
Henry