8326959: Improve JVMCI option help

[dougxc]

This PR improves the wording and layout of JVMCI options exposed to users.
All other JVMCI options are no longer included in the output of -XX:+JVMCIPrintProperties.

> java -XX:+JVMCIPrintProperties
[JVMCI properties]
jvmci.Compiler = null                                                     [String]
          Selects the system compiler. This must match the getCompilerName() value
          returned by a jdk.vm.ci.runtime.JVMCICompilerFactory provider.
          An empty string or the value "null" selects a compiler
          that raises an exception upon receiving a compilation request.

jvmci.PrintConfig = false                                                [Boolean]
          Prints VM values (e.g. flags, constants, field offsets etc) exposed to JVMCI.

---

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

Issue

• JDK-8326959: Improve JVMCI option help (Enhancement - P4)

Reviewers

• Tom Rodriguez (@tkrodriguez - Reviewer) ⚠️ Review applies to 12d0b6db

Reviewing

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[bridgekeeper]

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[openjdk]

@dougxc The following labels will be automatically applied to this pull request:

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[mlbridge]

Webrevs

• 05: Full - Incremental (ed5abd81)
• 04: Full - Incremental (52c20847)
• 03: Full - Incremental (12d0b6db)
• 02: Full - Incremental (c823d901)
• 01: Full - Incremental (f1470924)
• 00: Full (c6fff21a)

[openjdk]

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

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8326959: Improve JVMCI option help

Reviewed-by: never

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[dougxc]

Thanks for the review Tom.

/integrate

[openjdk]

Going to push as commit 43af120.

[openjdk]

@dougxc Pushed as commit 43af120.

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