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* [DAGCombine] Initialize the default operation action for SIGN_EXTEND_INREG ↵QingShan Zhang2020-01-031-0/+272
for vector type as 'expand' instead of 'legal' For now, we didn't set the default operation action for SIGN_EXTEND_INREG for vector type, which is 0 by default, that is legal. However, most target didn't have native instructions to support this opcode. It should be set as expand by default, as what we did for ANY_EXTEND_VECTOR_INREG. Differential Revision: https://reviews.llvm.org/D70000
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