Review request: 8013132: Add a flag to turn off the output of the verbose verification code

[Stefan Karlsson]

http://cr.openjdk.java.net/~stefank/8013132/webrev.00/

This RFE adds a new flag named VerifySilently, which can be used to turn 
off the verbose output that the verification code produces. The proposed 
name has been chosen to match other Verify flags.

 From the Bug description:
---
The HotSpot verification code is rather verbose and intrusive. I propose 
that we add a flag that can be used to turn this output off.

An example of the verification output:
$ java -XX:+PrintGC -XX:+UnlockDiagnosticVMOptions -XX:+VerifyBeforeExit 
-XX:+VerifyAfterGC -XX:+VerifyBeforeGC -XX:+UseConcMarkSweepGC 
-XX:+ExplicitGCInvokesConcurrent -cp /localhome/tests/ HelloSystemGC
  VerifyBeforeGC:[Verifying threads heap concurrent mark-sweep 
generation par new generation remset syms strs zone dict cldg metaspace 
chunks hand C-heap code cache ]
[GC (System.gc()) 672K->260K(121600K), 0.0060920 secs]
  VerifyAfterGC:[Verifying threads heap concurrent mark-sweep generation 
par new generation remset syms strs zone dict cldg metaspace chunks hand 
C-heap code cache ]
[Verifying threads heap concurrent mark-sweep generation par new 
generation remset syms strs zone dict cldg metaspace chunks hand C-heap 
code cache ]
[GC (CMS Initial Mark) 260K(121600K), 0.0204040 secs]
[Verifying threads heap concurrent mark-sweep generation par new 
generation remset syms strs zone dict cldg metaspace chunks hand C-heap 
code cache ]
[Verifying threads heap concurrent mark-sweep generation par new 
generation remset syms strs zone dict cldg metaspace chunks hand C-heap 
code cache ]
[GC (CMS Final Remark) [Verifying CMS Marking... done] 1604K(121600K), 
0.1008210 secs]
[Verifying threads heap concurrent mark-sweep generation par new 
generation remset syms strs zone dict cldg metaspace chunks hand C-heap 
code cache ]

And with the proposed flag turned on:
[GC (System.gc()) 672K->269K(121600K), 0.0050710 secs]
[GC (CMS Initial Mark) 269K(121600K), 0.0203380 secs]
[GC (CMS Final Remark) 1613K(121600K), 0.1007210 secs]
---

thanks,
StefanK
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