RFR: 8299915: Remove ArrayAllocatorMallocLimit and associated code [v8]

[Justin King]

On Fri, 13 Jan 2023 17:39:41 GMT, Justin King <jcking at openjdk.org> wrote:

>> Remove abstraction that is a holdover from Solaris. Direct usages of `MmapArrayAllocator` have been switched to normal `malloc`. The justification is that none of the code paths are called from signal handlers, so using `mmap` directly does not make sense and is potentially slower than going through `malloc` which can potentially re-use memory without making any system calls. The remaining usages of `ArrayAllocator` and `MallocArrayAllocator` are equivalent.
>
> Justin King has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Apply patch from stefank@
>   
>   Signed-off-by: Justin King <jcking at google.com>

Restored `mmap` for G1, though in the future it might make sense to switch to just using malloc.

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PR: https://git.openjdk.org/jdk/pull/11931