Fix simplifySwitchEnumUnreachableBlocks for default cases in ossa #77571
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Unlike non-ossa, ossa's switch_enum accepts an argument for the default case When all other cases are unreachable, replace the default block's phi with the switch_enum's operand and transform the switch_enum to a branch. Fixes rdar://139441002
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Unlike non-ossa, ossa's switch_enum accepts an argument for the default case When all other cases are unreachable, replace the default block's phi with the switch_enum's operand and transform the switch_enum to a branch.
Fixes rdar://139441002