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Disassembly of instructions can fail when llvm-objdump is not given the right set of architecture features, for example when the source is compiled with: clang -march=..+ext1+ext2 and disassembly is attempted with: llvm-objdump -mattr=+ext1 This patch avoids further analysing unknown instructions (as was happening before) when disassembly has failed. Differential Revision: https://reviews.llvm.org/D73531