RFR: 8293879: Remove unnecessary castings in jdk.hotspot.agent

[Andrey Turbanov]

On Thu, 15 Sep 2022 22:27:25 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Redundant castings make code harder to read.
>> Found them by IntelliJ IDEA.
>> I tried to choose only casts which are definitely safe to remove.
>> Most generification was done in [JDK-8241618](https://bugs.openjdk.org/browse/JDK-8241618), but casts weren't removed.
>
> src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/shared/GenCollectedHeap.java line 134:
> 
>> 132:     } else {
>> 133:       return VMObjectFactory.newObject(GenerationSpec.class,
>> 134:               oldGenSpecField.getAddress());
> 
> Maybe make each of these one line instead of two.

Other lines in this file don't exceed 80 chars. So, I think it's better to preserver line break here.

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PR: https://git.openjdk.org/jdk/pull/10295