RFR (S/M) expose L1_data_cache_line_size for diagnostic/sanity checks (8049717)

[Daniel D. Daugherty]

Greetings,

I have the fix for the following bug ready for JDK9 RT_Baseline:

     JDK-8049717 expose L1_data_cache_line_size for diagnostic/sanity
                 checks
     https://bugs.openjdk.java.net/browse/JDK-8049717

Here is the URL for the webrev:

http://cr.openjdk.java.net/~dcubed/8049717-webrev/0-jdk9-hs-rt/

This fix is a standalone piece from my Contended Locking reorder
and cache-line bucket. I've split it off as an independent bug fix
in order to make the reorder and cache-line bucket more clear.

Testing:

- JPRT test jobs
- manual testing of the new output via existing options:
   -XX:+UnlockExperimentalVMOptions -XX:SyncKnobs=Verbose=1
   -XX:+ExecuteInternalVMTests -XX:+VerboseInternalVMTests
- Aurora Adhoc nsk.sajdi and vm.parallel_class_loading as part of
   testing for my Contended Locking reorder and cache-line bucket

Thanks, in advance, for any comments, questions or suggestions.

Dan