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Commit a0b674fd authored by Adrian Prantl's avatar Adrian Prantl
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Fix UB in EmulateInstructionARM64.cpp 

This fixes an unhandled signed integer overflow in AddWithCarry() by
using the llvm::checkedAdd() function. Thats to Vedant Kumar for the
suggestion!

<rdar://problem/60926115>

Differential Revision: https://reviews.llvm.org/D80955
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