[mlir][linalg][bufferize] Reimplementation of scf.for bufferization

Instead of modifying the existing scf.for op, create a new op with memref OpOperands/OpResults and delete the old op.

New allocations / other memrefs can now be yielded from the loop. This functionality is deactivated by default and guarded against by AssertDestinationPassingStyle.

This change also introduces `replaceOp`, which will be utilized by all other `bufferize` implementations in future commits. Bufferization will then no longer rely on old (pre-bufferize) ops to DCE away. Instead old ops are deleted on the spot. This improves debuggability because there won't be any duplicate ops anymore (bufferized + not-yet-bufferized) when dumping IR during bufferization. It is also less fragile because unbufferized IR can no longer silently "hang around" due to an implementation bug.

Differential Revision: https://reviews.llvm.org/D114926