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Commit ab7689ec authored by Tim Northover's avatar Tim Northover
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Check whether MCInst operand isImm before calling getImm. 

When processing possible aliases, TableGen assumes that if an operand *can* be
an immediate, then it always *will* be. This is incorrect for the AArch64
backend. This patch inserts a check in the generated code to make sure isImm is
true first.

llvm-svn: 171972
parent f1450d8d
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