RFR: 8370077: C2: make Compile::_major_progress a boolean [v2]

[Dean Long]

On Wed, 22 Oct 2025 15:21:18 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Yes, I'd say just file an RFE, and link to the conversation here. Feel free to assign it to me if you don't want to own it ;)
>
> Let's ask @vnkozlov , @TobiHartmann and @rwestrel , do any of you have a good definition for the `major_progress` concept?

Until jdk11, there were comments in the code like this:
"If _major_progress, then more loop optimizations follow"
but those uses of major_progress() have been changed to !post_loop_opts_phase().  So "major progress" seems to imply "expect more loop opts".

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PR Review Comment: https://git.openjdk.org/jdk/pull/27912#discussion_r2453364617