[mlir][VectorToSCF] 128 byte alignment of alloc ops

Added 128 byte alignment to alloc ops created in VectorToSCF pass.
128b alignment was already introduced to this pass but not to all alloc
ops. This commit changes that by adding 128b alignment to the remaining ops.
The point of specifying alignment is to prevent possible memory alignment errors
on weakly tested architectures.

Differential Revision: https://reviews.llvm.org/D86454