[clang][bytecode] Fix const-in-mutable fields (#149286) For mutable and const fields, we have two bits in InlineDescriptor, which both get inherited down the hierarchy. When a field is both const and mutable, we CAN read from it if it is a mutable-in-const field, but we _can't_ read from it if it is a const-in-mutable field. We need another bit to distinguish the two cases.
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