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[ARM64] Fix a heap-use-after-free spotted by ASan.
StringRef::lower() returns a std::string. Better yet, we can now stop thinking about what it returns and write 'auto'. It does the right thing. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205135 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2653,7 +2653,7 @@ ARM64AsmParser::tryParseSystemRegister(OperandVector &Operands) {
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if (Tok.isNot(AsmToken::Identifier))
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return MatchOperand_NoMatch;
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StringRef ID = Tok.getString().lower();
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auto ID = Tok.getString().lower();
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ARM64SYS::SystemRegister Reg =
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StringSwitch<ARM64SYS::SystemRegister>(ID)
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.Case("spsr_el1", ARM64SYS::SPSR_svc)
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