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[DAGCombiner] Use the result value type in visitCONCAT_VECTORS
This triggers an assert when combining concat_vectors of a bitcast of merge_values. With asserts disabled, it fails to select: fatal error: error in backend: Cannot select: 0x7ff19d000e90: i32 = any_extend 0x7ff19d000ae8 0x7ff19d000ae8: f64,ch = CopyFromReg 0x7ff19d000c20:1, Register:f64 %1 0x7ff19d000b50: f64 = Register %1 In function: d Differential Revision: https://reviews.llvm.org/D55507 llvm-svn: 348759
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