RFR: 8265064: Move clearing and setting of members into helpers in ReservedSpace

[Thomas Schatzl]

On Mon, 12 Apr 2021 11:59:57 GMT, Stefan Johansson <sjohanss at openjdk.org> wrote:

> Currently there are a few places in `ReservedSpace` that updates a set of members directly during initialization. This could be refactored into helper functions to improve readability and also to pave way for some further cleanups.
> 
> This is one of a few cleanups I plan to do to enable a clean implementation of:
> [JDK-8261527: Record page size used for underlying mapping in ReservedSpace](https://bugs.openjdk.java.net/browse/JDK-8261527)
> 
> **Testing**
> Mach5 tier1 and tier2.

Changes requested by tschatzl (Reviewer).

src/hotspot/share/memory/virtualspace.cpp line 139:

> 137: 
> 138: void ReservedSpace::clear_members() {
> 139:   _base = NULL;

This method could call `initialize_members()` with the appropriate argument values, couldn't it?

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PR: https://git.openjdk.java.net/jdk/pull/3435