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The bitstream remark serializer landed in r367372. This adds a bitstream remark parser that parser bitstream remark files to llvm::remarks::Remark objects through the RemarkParser interface. A few interesting things to point out: * There are parsing helpers to parse the different types of blocks * The main parsing helper allows us to parse remark metadata and open an external file containing the encoded remarks * This adds a dependency from the Remarks library to the BitstreamReader library * The testing strategy is to create a remark entry through YAML, parse it, serialize it to bitstream, parse that back and compare the objects. * There are close to no tests for malformed bitstream remarks, due to the lack of textual format for the bitstream format. * This adds a new C API for parsing bitstream remarks: LLVMRemarkParserCreateBitstream. * This bumps the REMARKS_API_VERSION to 1. Differential Revision: https://reviews.llvm.org/D67134 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@371429 91177308-0d34-0410-b5e6-96231b3b80d8