8214003: Limit default test jobs based on memory size

[gdams]

This patch was partially backported in abcacae. This PR adds the remaining patch to make/RunTests.gmk.

This backport is a prerequisite to backporting openjdk/jdk@753c58b

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Integration blocker

 ⚠️ Dependency #1302 must be integrated first

Issue

• JDK-8214003: Limit default test jobs based on memory size

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk11u-dev pull/1307/head:pull/1307
$ git checkout pull/1307

Update a local copy of the PR:
$ git checkout pull/1307
$ git pull https://git.openjdk.org/jdk11u-dev pull/1307/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 1307

View PR using the GUI difftool:
$ git pr show -t 1307

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk11u-dev/pull/1307.diff

[bridgekeeper]

👋 Welcome back gdams! A progress list of the required criteria for merging this PR into pr/1302 will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 01: Full - Incremental (8e348a6c)
• 00: Full (8e348a6c)

[RealCLanger]

Hm, this one also rectifies things after the JDK-8212028 backport. Again, JDK-8214003 was already backported. Can you meld these changes into #1302 (and adapt JDK-8291794 accordingly)