RFR: 8359437: Make users and test suite not able to set LockingMode flag

[Alan Bateman]

On Tue, 17 Jun 2025 08:39:49 GMT, Anton Artemov <duke at openjdk.org> wrote:

> This PR contains changes for the 1st phase of the `LockingMode` flag obsoletion. 
> 
> The work is done by @fbredber, I have taken it over and am finishing it while he's on vacation. 
> 
> In the 1st phase one keeps the `LockingMode` variable in all places, but makes it non-settable from the command line. All the C1 and C2 code related to legacy locking will still be in place (but as dead code) and removed later (phase 2).
> 
> Lightweight locking is the default locking from now on.
> 
> Tested in tiers 1 - 7.

test/jdk/java/lang/Thread/virtual/Parking.java line 388:

> 386:     @ParameterizedTest
> 387:     @ValueSource(booleans = { true, false })
> 388:     @DisabledIf("LockingMode#isLegacy")

Would you mind checking if the import DisabledIf can be removed from these tests? I think we only used it to conditionally run when not legacy mode.

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PR Review Comment: https://git.openjdk.org/jdk/pull/25847#discussion_r2161946231