[6.0][Concurrency] CaseIterable synthesized allCases must be nonisolated #74255
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Description: allCases synthesized by CaseIterable should be
nonisolated
, as otherwise it'll conflict in isolation with global actor isolated enums.Scope/Impact: Global actor isolated enums with
CaseIterable
today don't compileRisk: Low, adds nonisolated to
allCases
Testing: CI testing
Reviewed by: @DougGregor
Original PR: #74254
Radar: rdar://127968265