RFR 8026324: hs_err improvement: Add summary section to hs_err file

[Coleen Phillimore]

8026333: hs_err improvement: Print GC Strategy
8026336: hs_err improvement: Print compilation mode, server, client or 
tiered
Summary: Added command line, summary cpu and os information to summary 
section.  Moved time of crash and duration in summary section.  Add GC 
strategy and compiler setting (tiered) to enhanced version string in 
error report.  Moved the stack trace sooner in hs_err file.

See new summary format in bug report and some samples.

open webrev at http://cr.openjdk.java.net/~coleenp/8026324.01/
bug link https://bugs.openjdk.java.net/browse/JDK-8026324

Tested with RBT quick tests (tests that run on all platforms). Verified 
on crash logs on all platforms available inside Oracle either with 
crashing test or C++ program with same new code (or both), and various 
scenarios of missing cpuinfo/distribution files.

Thanks,
Coleen