[SCFToCalyx] Adapt to upstream change in LoopLikeOpInterface.

This PR adapts to a change in `LoopLikeOpInterface` from
llvm/llvm-project#158679, which changed the API for getting a statically
known iteration count. The PR adapts to the change by using the accessor
of the `ForOp` for exactly that information instead of relying on a free
function that takes the properties/operands of the op.

Signed-off-by: Ingo Müller <[email protected]>

Author: ingomueller-net

lib/Conversion/SCFToCalyx/SCFToCalyx.cpp

@@ -96,9 +96,10 @@ class ScfForOp : public calyx::RepeatOpInterface<scf::ForOp> {
   }
 
   std::optional<int64_t> getBound() override {
-    return constantTripCount(getOperation().getLowerBound(),
-                             getOperation().getUpperBound(),
-                             getOperation().getStep());
+    auto scfForOp = mlir::cast<scf::ForOp>(getOperation());
+    if (std::optional<APInt> bound = scfForOp.getStaticTripCount())
+      return bound->getZExtValue();
+    return std::nullopt;
   }
 };