message: Fix -Wsign-compare in Toy LateLowering.
diff: @@ -249,7 +249,7 @@ public:
  ScopedContext scope(rewriter, loc);
  MemRefView vOp(result);
  IndexedValue iOp(result);
  - for (uint64_t i = 0; i < shape[0]; ++i) {
  + for (uint64_t i = 0, ie = shape[0]; i < ie; ++i) {
  if (shape.size() == 1) {
  auto value = cstValue.getValue(ArrayRef<uint64_t>{i})
  .cast<FloatAttr>()
  @@ -257,7 +257,7 @@ public:
  iOp(constant_index(i)) = constant_float(value, f64Ty);
  continue;
  }
  - for (uint64_t j = 0; j < shape[1]; ++j) {
  + for (uint64_t j = 0, je = shape[1]; j < je; ++j) {
  auto value = cstValue.getValue(ArrayRef<uint64_t>{i, j})
  .cast<FloatAttr>()
  .getValue();
  