[Flang] Attempt to fix tests

Author: artagnon

flang/test/Integration/unroll-loops.f90

@@ -25,7 +25,7 @@ subroutine unroll(a)
     ! NO-UNROLL-NEXT: %[[GEP:.*]] = getelementptr i64, ptr %[[ARG0]], i64 %[[IND]]
     ! NO-UNROLL-NEXT: store <2 x i64> %[[VIND]], ptr %[[GEP]]
     ! NO-UNROLL-NEXT: %[[NIV:.*]] = add nuw i64 %{{.*}}, 2
-    ! NO-UNROLL-NEXT: %[[NVIND]] = add <2 x i64> %[[VIND]], splat (i64 2)
+    ! NO-UNROLL-NEXT: %[[NVIND]] = add nuw nsw <2 x i64> %[[VIND]], splat (i64 2)
     !
     ! UNROLL-NEXT: %[[VIND1:.*]] = add <2 x i64> %[[VIND]], splat (i64 2)
     ! UNROLL-NEXT: %[[GEP0:.*]] = getelementptr i64, ptr %[[ARG0]], i64 %[[IND]]

flang/test/Lower/HLFIR/unroll-loops.fir

@@ -27,7 +27,7 @@ func.func @unroll(%arg0: !fir.ref<!fir.array<1000 x index>> {fir.bindc_name = "a
     // NO-UNROLL-NEXT: %[[GEP:.*]] = getelementptr i64, ptr %[[ARG0]], i64 %[[IND]]
     // NO-UNROLL-NEXT: store <2 x i64> %[[VIND]], ptr %[[GEP]]
     // NO-UNROLL-NEXT: %[[NIV:.*]] = add nuw i64 %{{.*}}, 2
-    // NO-UNROLL-NEXT: %[[NVIND]] = add <2 x i64> %[[VIND]], splat (i64 2)
+    // NO-UNROLL-NEXT: %[[NVIND]] = add nuw nsw <2 x i64> %[[VIND]], splat (i64 2)
 
     // UNROLL-NEXT: %[[VIND1:.*]] = add <2 x i64> %[[VIND]], splat (i64 2)
     // UNROLL-NEXT: %[[GEP0:.*]] = getelementptr i64, ptr %[[ARG0]], i64 %[[IND]]