[GR-68116] Enable shared arena support by default. #11828
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This enables shared arena support by default.
There is one exception: Shared arena support is currently not compatible with vector API support. We still have to fix a problem for this combination.
The logic in
SubstrateOptions.isSharedArenaSupportEnabled
considers that an won't enable shared arena support if vector API support is explicitly enabled.It is still possible to override that behavior by explicitly providing
-H:±SharedArenaSupport
.