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Use the ARMBaseRegisterInfo to query the frame register. The base register info is aware of the frame register that is used for the frame pointer. Use that to determine the frame register rather than duplicating the knowledge. Although, the code path is slightly different in that it may return SP, that can only occur if the frame pointer has been omitted in the machine function, which is supposed to contain the desired value in that case. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209084 91177308-0d34-0410-b5e6-96231b3b80d8
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