Fix oversight while refactoring code in 207198873 (Fix ForStmt and StmtBlock

destructors).

getStatements().clear() should have been clear() in Statements.h.

PiperOrigin-RevId: 207270417

mlir/include/mlir/IR/Statements.h

@@ -206,7 +206,7 @@ public:
     // Explicitly erase statements instead of relying of 'StmtBlock' destructor
     // since child statements need to be destroyed before the MLValue that this
     // for stmt represents is destroyed.
-    getStatements().clear();
+    clear();
   }
 
   AffineConstantExpr *getLowerBound() const { return lowerBound; }