[IR] Replace blockaddress refcount with single flag (#138239) BasicBlock currently has a blockaddress refcount. However, blockaddresses are uniqued, which means that there can only be a single blockaddress for a given BasicBlock. Prior to #137958 there were some edge case exceptions to this, but now it always holds. As such, replace the refcount with a single flag. As we're now just tracking two bits, I've dropped the BasicBlockBits structure, as I found it more annoying than useful (esp with the weird AIX workarounds). Instead handle the subclass data the same way we do in Operators.
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