8346438: [JVMCI] Speculation encoding improvements

[tkrodriguez]

This is a draft of some basic improvements to speculation encoding and sanity checking

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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

Issue

• JDK-8346438: [JVMCI] Speculation encoding improvements (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/22771/head:pull/22771
$ git checkout pull/22771

Update a local copy of the PR:
$ git checkout pull/22771
$ git pull https://git.openjdk.org/jdk.git pull/22771/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 22771

View PR using the GUI difftool:
$ git pr show -t 22771

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/22771.diff

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[openjdk]

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See the Progress checklist in the description for automated requirements.

[openjdk]

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