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
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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171972 91177308-0d34-0410-b5e6-96231b3b80d8