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Previously all `blockaddress()` constants were treated as forward references. They were resolved twice: once at the end of the function in question, and again at the end of the module. Furthermore, if the same blockaddress was referenced N times, the parser created N distinct `GlobalVariable`s (one for each reference). Instead, resolve all block addresses at the beginning of the function, creating the standard `BasicBlock` forward references used for all other basic block references. After the function, all references can be resolved immediately. To check for the condition of parsing block addresses from within the same function, I created a reference to the current per-function-state in `BlockAddressPFS`. Also, create only one forward-reference per basic block. Because forward references to block addresses are rare, the data structure here shouldn't matter. If somehow it does someday, this can be pretty easily changed to a `DenseMap<std::pair<ValID, ValID>, GV>`. This is part of PR20515. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215952 91177308-0d34-0410-b5e6-96231b3b80d8
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