[MLIR][Presburger] enable copy assignment operator for Simplex

This patch removes the `const` from `usingBigM` to enable the implicit copy assignment operator for Simplex.

Reviewed By: Groverkss

Differential Revision: https://reviews.llvm.org/D120542

diff --git a/mlir/include/mlir/Analysis/Presburger/Simplex.h b/mlir/include/mlir/Analysis/Presburger/Simplex.h
index 83f4d39..da1e55a 100644 (file)
--- a/mlir/include/mlir/Analysis/Presburger/Simplex.h
+++ b/mlir/include/mlir/Analysis/Presburger/Simplex.h
@@ -308,7 +308,7 @@ protected:
   unsigned getNumFixedCols() const { return usingBigM ? 3u : 2u; }
 
   /// Stores whether or not a big M column is present in the tableau.
-  const bool usingBigM;
+  bool usingBigM;
 
   /// The number of rows in the tableau.
   unsigned nRow;