RFR: 8282621: G1: G1SegmentedArray remove unnecessary template parameter

[Kim Barrett]

On Fri, 4 Mar 2022 11:28:14 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

> Hi all,
> 
> Please review this refactoring change to remove unnecessary template parameters. The change has two commits, one to remove the template parameter, this allows for the second clean up to hoist `G1CardSetAllocator` parameter independent methods and variables into a base class.
> 
> Testing: Tier 1.

src/hotspot/share/gc/g1/g1CardSetMemory.cpp line 73:

> 71: template <class Slot>
> 72: G1CardSetAllocator<Slot>::G1CardSetAllocator(const char* name,
> 73:                                              const G1CardSetAllocOptions* alloc_options,

There don't seem to be any specializations of this other than `G1CardSetAllocator<G1CardSetContainer>`.  Unless there are future planned specializations it seems like there's no need for the new non-template base class.  Just get rid of the template parameter and directly replace uses of `Slot` with `G1CardSetContainer`.

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PR: https://git.openjdk.java.net/jdk/pull/7689