[mlir] translate memref.reshape ops that have static shapes

This patch references code for translating memref.reinterpret_cast ops
to add translation rules for memref.reshape ops that have a static shape
argument.  Since reshape ops don't have offsets, sizes, or strides, this
patch simply sets the allocated and aligned pointers of the MemRef
descriptor.

Reviewed By: ftynse, cathyzhyi

Differential Revision: https://reviews.llvm.org/D125039