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d18ae9e2c7
- Fold the lower/upper bound of a loop to a constant whenever the result of the
application of the bound's affine map on the operand list yields a constant.
- Update/complete 'for' stmt's API to set lower/upper bounds with operands.
Resolve TODOs for ForStmt::set{Lower,Upper}Bound.
- Moved AffineExprConstantFolder into AffineMap.cpp and added
AffineMap::constantFold to be used by both AffineApplyOp and
ForStmt::constantFoldBound.
PiperOrigin-RevId: 215997346