RFR: 8253098: Archived full module graph should be disabled if CDS heap cannot be mapped

[Calvin Cheung]

On Mon, 14 Sep 2020 21:40:50 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> Please review this simple fix -- `MetaspaceShared::use_full_module_graph()` depends on the CDS heap. It should be
> disabled if the CDS heap cannot be mapped.

Looks good.

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Marked as reviewed by ccheung (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/158