[ARM] Define ComplexPatternFuncMutatesDAG
Some of the Arm complex pattern functions call canExtractShiftFromMul, which can modify the DAG in-place. For this to be valid and handled successfully we need to define ComplexPatternFuncMutatesDAG. Differential Revision: https://reviews.llvm.org/D107476 (cherry picked from commit 77e8f4ee)
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