RFR: 8283469: Don't use memset to initialize members in FileMapInfo and fix memory leak

[Zhengyu Gu]

On Tue, 22 Mar 2022 05:12:57 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Isn't this one of the things we have to guarantee was zeroed at initialization to produce deterministic shared archive contents?
>> 
>> David
>
>> Isn't this one of the things we have to guarantee was zeroed at initialization to produce deterministic shared archive contents?
>> 
>> David
> 
> `FileMapInfo` is derived from `CHeapObj<mtInternal>` so it's allocated by os::malloc, which zeros the memory when `DumpSharedSpaces == true`.

Thanks for the reviews, @iklam @kimbarrett

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PR: https://git.openjdk.java.net/jdk/pull/7899