[SILGen] Emit block after unreachable when emitting if/switch expressions #66551
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When emitting the underlying
switch
statement for aswitch
expression, we emit anunreachable
if the subject is uninhabited. Statement emission code can handle this, but expression emission expects an RValue to handed back. To remedy this, emit an unreachable block that we can emit the rest of the expression emission code into. The SILOptimizer will then drop this unreachable block.Resolves #66490
rdar://110636210