[lworld] RFR: [lworld] Enable all flattening by default

[Tobias Hartmann]

On Wed, 4 Jun 2025 17:48:07 GMT, Chen Liang <liach at openjdk.org> wrote:

> Do we need to adjust the flags in valhalla tests, at least the compiler ones, such as ones that turn these on, or are there no such test triggers yet?

We have a few tests that explicitly turn these flags on because they perform some (IR) verification that relies on flattening. I think that should stay since the flags can still be turned off via the command line.

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PR Comment: https://git.openjdk.org/valhalla/pull/1480#issuecomment-2942789016