[heap] Add API function for checking if the heap limit was increased

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 4a7ba35e42be1346c6db0f96909af7db1ed38f1e..2a57ea5d619acdc17db4eb2036f3ec27e80f0c0f 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -956,13 +956,16 @@ class Heap {
     return memory_pressure_level_.Value() != MemoryPressureLevel::kNone;
   }
 
-  void IncreaseHeapLimitForDebugging() {
+  size_t HeapLimitForDebugging() {
     const size_t kDebugHeapSizeFactor = 4;
     size_t max_limit = std::numeric_limits<size_t>::max() / 4;
+    return Min(max_limit,
+               initial_max_old_generation_size_ * kDebugHeapSizeFactor);
+  }
+
+  void IncreaseHeapLimitForDebugging() {
     max_old_generation_size_ =
-        Max(max_old_generation_size_,
-            Min(max_limit,
-                initial_max_old_generation_size_ * kDebugHeapSizeFactor));
+        Max(max_old_generation_size_, HeapLimitForDebugging());
   }
 
   void RestoreOriginalHeapLimit() {
@@ -973,6 +976,10 @@ class Heap {
             Max(initial_max_old_generation_size_, min_limit));
   }
 
+  bool IsHeapLimitIncreasedForDebugging() {
+    return max_old_generation_size_ == HeapLimitForDebugging();
+  }
+
   // ===========================================================================
   // Initialization. ===========================================================
   // ===========================================================================