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Fix Power GEMV order of operations in predux for MMA.

Chip Kerchnerrequested to merge
ChipKerchner/eigen:fixGEMVOrderOfOperations into master

A rare unit test failure showed a difference of the order of operations in predux (add all the elements together for a Packet) for GEMV MMA. Changing it to be similar to the VSX version and reduce the number of instructions from 20 to 7. Fix some inline assembly for GCC that no longer compiles/assembles.

Edited by Chip Kerchner

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