RFR: 8253910: UseCompressedClassPointers depends on UseCompressedOops in vmError.cpp

[Aleksey Shipilev]

As noted in the bug report, there are places in `vmError.cpp`, where information on compressed classes is only printed if compressed oops are enabled. After JDK-8241825 both features should be independent. In addition to 2 reported places, we also need to print the setting in JVM modeline.

Sample outputs:

Command Line: Crash
...
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 17-internal+0-adhoc.shade.jdk, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
...
VM Mutex/Monitor currently owned by a thread: None

Heap address: 0x0000000082000000, size: 30688 MB, Compressed Oops mode: Zero based, Oop shift amount: 3

CDS archive(s) mapped at: [0x0000000800000000-0x0000000800c5c000-0x0000000800c5c000), size 12959744, SharedBaseAddress: 0x0000000800000000, ArchiveRelocationMode: 0.
Compressed class space mapped at: 0x0000000801000000-0x0000000841000000, reserved size: 1073741824
Narrow klass base: 0x0000000800000000, Narrow klass shift: 3, Narrow klass range: 0x100000000

GC Precious Log:

Command Line: -XX:-UseCompressedOops Crash
...
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 17-internal+0-adhoc.shade.jdk, mixed mode, sharing, tiered, compressed class ptrs, g1 gc, linux-amd64)
...
VM Mutex/Monitor currently owned by a thread: None

CDS archive(s) mapped at: [0x0000000800000000-0x0000000800c2f000-0x0000000800c2f000), size 12775424, SharedBaseAddress: 0x0000000800000000, ArchiveRelocationMode: 0.
Compressed class space mapped at: 0x0000000801000000-0x0000000841000000, reserved size: 1073741824
Narrow klass base: 0x0000000800000000, Narrow klass shift: 3, Narrow klass range: 0x100000000

GC Precious Log:
...

Command Line: -XX:-UseCompressedOops -XX:-UseCompressedClassPointers Crash
...
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 17-internal+0-adhoc.shade.jdk, mixed mode, tiered, g1 gc, linux-amd64)
...
VM Mutex/Monitor currently owned by a thread: None

GC Precious Log:
...

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

Commit messages:
 - 8253910: UseCompressedClassPointers depends on UseCompressedOops in vmError.cpp

Changes: https://git.openjdk.java.net/jdk/pull/1974/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1974&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253910
  Stats: 19 lines in 1 file changed: 8 ins; 0 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1974.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1974/head:pull/1974

PR: https://git.openjdk.java.net/jdk/pull/1974