[turbofan] Track multiple maps for LoadElimination.

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index 8f1ecfc21ef7ce57cb7ce3677e6cd2de6956fe36..d59ea7f4b363d016c45f1b0d89af1acd7a2ca647 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -12,6 +12,7 @@
 #include "src/handles.h"
 #include "src/machine-type.h"
 #include "src/objects.h"
+#include "src/zone/zone-handle-set.h"
 
 namespace v8 {
 namespace internal {
@@ -140,6 +141,27 @@ std::ostream& operator<<(std::ostream&, CheckForMinusZeroMode);
 
 CheckForMinusZeroMode CheckMinusZeroModeOf(const Operator*) WARN_UNUSED_RESULT;
 
+// A descriptor for map checks.
+class CheckMapsParameters final {
+ public:
+  explicit CheckMapsParameters(ZoneHandleSet<Map> const& maps) : maps_(maps) {}
+
+  ZoneHandleSet<Map> const& maps() const { return maps_; }
+
+ private:
+  ZoneHandleSet<Map> const maps_;
+};
+
+bool operator==(CheckMapsParameters const&, CheckMapsParameters const&);
+bool operator!=(CheckMapsParameters const&, CheckMapsParameters const&);
+
+size_t hash_value(CheckMapsParameters const&);
+
+std::ostream& operator<<(std::ostream&, CheckMapsParameters const&);
+
+CheckMapsParameters const& CheckMapsParametersOf(Operator const*)
+    WARN_UNUSED_RESULT;
+
 // A descriptor for growing elements backing stores.
 enum class GrowFastElementsFlag : uint8_t {
   kNone = 0u,
@@ -310,7 +332,7 @@ class SimplifiedOperatorBuilder final : public ZoneObject {
 
   const Operator* CheckIf();
   const Operator* CheckBounds();
-  const Operator* CheckMaps(int map_input_count);
+  const Operator* CheckMaps(ZoneHandleSet<Map>);
 
   const Operator* CheckHeapObject();
   const Operator* CheckNumber();