[5.9][Sema] InitAccessors: Don't synthesize default memberwise arg for ini… #66464
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…t accessor initializations
Cherry-pick of #66463
Default arguments for
init accessors
are not fully supported at the moment,so we shouldn't attempt to synthesize them in Sema just to crash during linking.
Scope: memberwise initializers with init accessor properties.
Main Branch PR: [Sema] InitAccessors: Don't synthesize default memberwise arg for ini… #66463
Risk: Very Low (guarded by experimental feature flag)
Reviewed By: @hborla
Testing: Only manual testing until FIXME is resolved.
(cherry picked from commit 8c54d3d)