Refactor confusing if for xacquire/xrelease (#1173)
Refactor confusing if for xacquire/xrelease (#1173)

Sync with https://github.com/llvm-mirror/llvm/blob/7cdce81/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp#L362
AmesianX/capstone,AmesianX/capstone,AmesianX/capstone,bSr43/capstone,AmesianX/capstone,AmesianX/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,bSr43/capstone,AmesianX/capstone,AmesianX/capstone