Merge main -> google

* 8b3790d5b [spirv] Remove code for deprecated Linalg on buffers path (#5626)
* 5e66689d3 Guessing at making MacOS happy. (#5654)
* 9475b3aeb Merge google -> main (#5646)
* e221e5e9e [Talks] 2020-08-20: IREE CodeGen; MLIR ODM (#5585)
* 1696d8c42 Only add operand-fusion to MobileNetV2. (#5639)
* 9eaa01bbd Integrate MLIR-EmitC at iml130/mlir-emitc@679d7183 (#5633)
* 7d0ab9ad3 [spirv] Delete experimental matmul vectorization code (#5638)

PiperOrigin-RevId: 370960412