[mlir] Don't assert when simplifying certain `AffineExpr`s (#78855) Currently, `simplifyMul()` asserts that either `lhs` or `rhs` is symbolic or constant. This method is called by the overloaded `*` operator for `AffineExpr`s which leads to a crash when building a multiplication expression where neither operand is symbolic or constant. This patch returns a `nullptr` from `simplifyMul()` to signal that the expression could not be simplified instead. Fix https://github.com/llvm/llvm-project/issues/75770
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