[mlir][bufferize] Better implementation of AnalysisState::isTensorYielded

If `create-deallocs=0`, mark all bufferization.alloc_tensor ops as escaping. (Unless they already have an `escape` attribute.) In the absence of analysis information, check SSA use-def chains to see if the value may be yielded.

Differential Revision: https://reviews.llvm.org/D127302