[master] RFR: Enforce +UseCompressedClassPointers [v2]

[Aleksey Shipilev]

On Mon, 17 May 2021 16:34:10 GMT, Roman Kennke <rkennke at openjdk.org> wrote:

>> This change force-enables +UseCompressedClassPointers. This is required for the next step where we want to store the compressed class pointers into object headers. The change also removes test configurations that explicitely disable CCP.
>> In the long run, we would remove the flag altogether, but not now.
>> 
>> Testing:
>>  - [x] tier1
>>  - [x] tier2
>
> Roman Kennke has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Update test/hotspot/jtreg/gc/metaspace/TestSizeTransitions.java
>    
>    Co-authored-by: Aleksey Shipilëv <aleksey.shipilev at gmail.com>
>  - Update src/hotspot/share/runtime/arguments.cpp
>    
>    Co-authored-by: Aleksey Shipilëv <aleksey.shipilev at gmail.com>

Marked as reviewed by shade (Committer).

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PR: https://git.openjdk.java.net/lilliput/pull/5