8313882: Fix -Wconversion warnings in runtime code

[shipilev]

Unclean backport to provide cleaner ground for future backports.

There were two minor conflicts in attachListener.cpp and globals.hpp.

Additional testing:

• Linux x86_64 server fastdebug, all

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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
• JDK-8313882 needs maintainer approval

Issue

• JDK-8313882: Fix -Wconversion warnings in runtime code (Bug - P4)

Reviewers

• Paul Hohensee (@phohensee - Reviewer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk21u-dev.git pull/788/head:pull/788
$ git checkout pull/788

Update a local copy of the PR:
$ git checkout pull/788
$ git pull https://git.openjdk.org/jdk21u-dev.git pull/788/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 788

View PR using the GUI difftool:
$ git pr show -t 788

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk21u-dev/pull/788.diff

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[bridgekeeper]

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[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

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

[mlbridge]

Webrevs

• 00: Full (9483b239)

[openjdk]

⚠️ @shipilev This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[shipilev]

On hold, I see that it breaks Graal due to field type change: JDK-8314247. The underlying reason for this backport is to make JDK-8327743 cleaner, but it might be too much of the risk to take for extra cleanliness.

[shipilev]

Closing due to the reason above. JDK-8327743 backport (#523) had been amended to deviate a bit from upstream change. This will not break Graal just for backport cleanliness reasons.