* removed warning missing return, dangling else
* fixed errors, made sure to return false in all shape inference failures
* shape inference use LogicalResults as return value
* format fixed
* format error
* additional error correction
* handle errors properly for all former emitError site, using either emitError, assert, or llvm_unreachable
* help added
* fixes
* edit of doc
* doc edit
* enable promote attr for pad
* use optional arguments for pad
* shape infereance for pad
* Lowering Pad
* format file
* use DenseTensor for the attribute
* use Pad in ONNXRewrite
* fix the merge conflict
* fix the attr given to constantOp
* handle ONNXConstantOp in attribute promotion
* Fix bug when AttributePromotion is called more than once
* update ONNXOps.td.inc with correct version of onnx
* update onnx.md
* responses to review
* fix the build error
* change the implementation of Pad
* delete commented out code
* clang format
Co-authored-by: Tian Jin <tjingrant@gmail.com>
Alexandre Eichenberger
chentong319