[master] RFR: Enforce +UseCompressedClassPointers [v3]

[Aleksey Shipilev]

On Mon, 17 May 2021 20:01:31 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
>>  - [x] build x86 (32bit)
>
> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Disable CompressedClassPointers only on 64bits; flag is read-only and false on 32 bit already

Marked as reviewed by shade (Committer).

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