RFR: 8286475: Drop --enable-preview from instanceof pattern matching related tests [v2]

[Joe Darcy]

On Tue, 10 May 2022 14:57:47 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> There are plenty of tests failing on many architectures due to `--enable-preview` VM code introduced by Loom. This improvement eliminates some of the redundant `--enable-preview` clauses from the instanceof pattern matching tests, since instanceof pattern matching have been graduated from preview in JDK 16. 
>> 
>> Additional testing:
>>  - [x] Linux x86_64 fastdebug, affected tests still pass
>>  - [x] Linux x86_32 fastdebug, affected tests start to pass
>
> Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Copyright years

Marked as reviewed by darcy (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8628