8373208: Make Atomic class template constant initializable

[kimbarrett]

Please review this change to Atomic to meet the requirements for constant
initialization in cases where the value type provides the requisite support.
This ensures that in such cases dynamic initialization won't even be
considered a possibility when initialized with constant arguments.

Testing: mach5 tier1

---

Progress

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Issue

• JDK-8373208: Make Atomic class template constant initializable (Enhancement - P4)

Reviewers

• Stefan Karlsson (@stefank - Reviewer)

Reviewing

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[openjdk]

@kimbarrett This change now passes all automated pre-integration checks.

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After integration, the commit message for the final commit will be:

8373208: Make Atomic class template constant initializable

Reviewed-by: stefank

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At the time when this comment was updated there had been 28 new commits pushed to the master branch:

• 1bbbce7: 6726690: SwingUtilities.replaceUI*Map() methods do not remove previously installed maps
• a5968f9: 8371968: RISC-V: implement AES CBC intrinsics
• d36a234: 8368701: CDS VerifierTest_1A.java failed on machines with 512 GB RAM
• ... and 25 more: https://git.openjdk.org/jdk/compare/8df3f3d3417bc8fdb5a75d986e084441bbf6ebd2...master

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[mlbridge]

Webrevs

• 00: Full (e3f6f8a1)

[stefank]

On the surface, this looks fine to me.