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Refactor logic so that we know up-front whether to open a block and whether we need an MDString abbreviation. This is almost NFC, but will start emitting `MDString` abbreviations when the first record is not an `MDString`. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225712 91177308-0d34-0410-b5e6-96231b3b80d8