RFR: 8275775: Add jcmd VM.classes to print details of all classes

[Yi Yang]

Add VM.classes to print details of all classes, output looks like:

1. jcmd VM.classes

KlassAddr Size State Flags LoaderName ClassName
0x0000000800c0b400 62 inited W bootstrap java.lang.invoke.LambdaForm$MH/0x0000000800c0b400
0x0000000800c0b000 62 inited W bootstrap java.lang.invoke.LambdaForm$DMH/0x0000000800c0b000
0x0000000800c0ac00 62 inited W bootstrap java.lang.invoke.LambdaForm$MH/0x0000000800c0ac00
...

2. jcmd VM.classes verbose

KlassAddr Size State Flags LoaderName ClassName
0x0000000800c0b400 62 inited W bootstrap java.lang.invoke.LambdaForm$MH/0x0000000800c0b400
java.lang.invoke.LambdaForm$MH/0x0000000800c0b400 {0x0000000800c0b400}
 - instance size: 2
 - klass size: 62
 - access: final synchronized
 - state: inited
 - name: 'java/lang/invoke/LambdaForm$MH+0x0000000800c0b400'
 - super: 'java/lang/Object'
 - sub:
 - arrays: NULL
 - methods: Array<T>(0x00007f620841f210)
 - method ordering: Array<T>(0x0000000800a7e5a8)
 - default_methods: Array<T>(0x0000000000000000)
 - local interfaces: Array<T>(0x00000008005af748)
 - trans. interfaces: Array<T>(0x00000008005af748)
 - constants: constant pool [41] {0x00007f620841f030} for 'java/lang/invoke/LambdaForm$MH+0x0000000800c0b400' cache=0x00007f620841f380
 - class loader data: loader data: 0x00007f61c804a690 of 'bootstrap' has a class holder
 - source file: 'LambdaForm$MH'
 - class annotations: Array<T>(0x0000000000000000)
 - class type annotations: Array<T>(0x0000000000000000)
 - field annotations: Array<T>(0x0000000000000000)
 - field type annotations: Array<T>(0x0000000000000000)
 - inner classes: Array<T>(0x00000008005af6d8)
 - nest members: Array<T>(0x00000008005af6d8)
 - permitted subclasses: Array<T>(0x00000008005af6d8)
 - java mirror: a 'java/lang/Class'{0x000000011f4b3968} = 'java/lang/invoke/LambdaForm$MH+0x0000000800c0b400'
 - vtable length 5 (start addr: 0x0000000800c0b5b8)
 - itable length 2 (start addr: 0x0000000800c0b5e0)
 - ---- static fields (1 words):
 - static final '_D_0' 'Ljava/lang/invoke/LambdaForm;' @112
 - ---- non-static fields (0 words):
 - non-static oop maps:
0x0000000800c0b000 62 inited W bootstrap java.lang.invoke.LambdaForm$DMH/0x0000000800c0b000
java.lang.invoke.LambdaForm$DMH/0x0000000800c0b000 {0x0000000800c0b000}
 - instance size: 2
 - klass size: 62
 - access: final synchronized
 - state: inited
 - name: 'java/lang/invoke/LambdaForm$DMH+0x0000000800c0b000'
 - super: 'java/lang/Object'
 - sub:
 - arrays: NULL
 - methods: Array<T>(0x00007f620841ea68)
 - method ordering: Array<T>(0x0000000800a7e5a8)
 - default_methods: Array<T>(0x0000000000000000)
 - local interfaces: Array<T>(0x00000008005af748)
 - trans. interfaces: Array<T>(0x00000008005af748)
 - constants: constant pool [49] {0x00007f620841e838} for 'java/lang/invoke/LambdaForm$DMH+0x0000000800c0b000' cache=0x00007f620841ebe0
 - class loader data: loader data: 0x00007f61c804a750 of 'bootstrap' has a class holder
 - source file: 'LambdaForm$DMH'
 - class annotations: Array<T>(0x0000000000000000)
 - class type annotations: Array<T>(0x0000000000000000)
 - field annotations: Array<T>(0x0000000000000000)
 - field type annotations: Array<T>(0x0000000000000000)
 - inner classes: Array<T>(0x00000008005af6d8)
 - nest members: Array<T>(0x00000008005af6d8)
 - permitted subclasses: Array<T>(0x00000008005af6d8)
 - java mirror: a 'java/lang/Class'{0x000000011f4b0968} = 'java/lang/invoke/LambdaForm$DMH+0x0000000800c0b000'
 - vtable length 5 (start addr: 0x0000000800c0b1b8)
 - itable length 2 (start addr: 0x0000000800c0b1e0)
 - ---- static fields (1 words):
 - static final '_D_0' 'Ljava/lang/invoke/LambdaForm;' @112
 - ---- non-static fields (0 words):
...

-------------

Commit messages:
 - 8275775 Add VM.classes to print details of all classes

Changes: https://git.openjdk.java.net/jdk/pull/7105/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7105&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275775
  Stats: 176 lines in 6 files changed: 174 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7105.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7105/head:pull/7105

PR: https://git.openjdk.java.net/jdk/pull/7105