[6.0] LocalVariableUtils: add support for temporary enum initialization. #73025
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Fixes rdar://121612548 (🏅[nonescapable] Test a working ~Escapable Optional-like type)
(cherry picked from commit fc60925)
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Explanation: LocalVariableUtils: add support for temporary enum initialization.
Scope: Required to build an conditionally ~Escapable Optional type.
Radar/SR Issues: rdar://121612548 (🏅[nonescapable] Test a working ~Escapable Optional-like type)
Original PR: #73015
Risk: This has zero effect on code that doesn't use the experimental feature.
Testing: A standalone implementation of stdlib Optional was added as a unit test.
Reviewer: @nate-chandler