android: Bitstream: add support for libLLVMBitstreamReader

android: Bitstream: add support for libLLVMBitstreamReader

To avoid following building errors:

external/llvm/lib/Bitcode/Reader/BitcodeAnalyzer.cpp:570: error: undefined reference to 'llvm::BitstreamCursor::ReadBlockInfoBlock(bool)'
external/llvm/lib/Bitcode/Reader/BitcodeAnalyzer.cpp:747: error: undefined reference to 'llvm::BitstreamCursor::EnterSubBlock(unsigned int, unsigned int*)'
...
external/llvm/lib/Bitcode/Reader/BitcodeAnalyzer.cpp:974: error: undefined reference to 'llvm::BitstreamCursor::skipRecord(unsigned int)'
external/llvm/lib/Bitcode/Reader/BitcodeAnalyzer.cpp:819: error: undefined reference to 'llvm::BitstreamCursor::ReadAbbrevRecord()'
external/llvm/lib/Bitcode/Reader/BitcodeAnalyzer.cpp:831: error: undefined reference to 'llvm::BitstreamCursor::readRecord(unsigned int, llvm::SmallVectorImpl<unsigned long long>&, llvm::StringRef*)'
...
external/llvm/lib/Bitcode/Reader/BitcodeReader.cpp:6402: error: undefined reference to 'llvm::BitstreamCursor::skipRecord(unsigned int)'
external/llvm/lib/Bitcode/Reader/BitcodeReader.cpp:6252: error: undefined reference to 'llvm::BitstreamCursor::EnterSubBlock(unsigned int, unsigned int*)'
external/llvm/lib/Bitcode/Reader/BitcodeReader.cpp:6278: error: undefined reference to 'llvm::BitstreamCursor::readRecord(unsigned int, llvm::SmallVectorImpl<unsigned long long>&, llvm::StringRef*)'
...
external/llvm/lib/Bitcode/Reader/BitcodeReader.cpp:3041: error: undefined reference to 'llvm::BitstreamCursor::ReadBlockInfoBlock(bool)'
clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation)