[heap] Reland decrease large object limit for regular heap objects.

src/heap/spaces.h

Index: src/heap/spaces.h
diff --git a/src/heap/spaces.h b/src/heap/spaces.h
index 69a8d89fccba5c5aa06f91d2a1995870b70ef033..5f6a83f4f70475616c25e580b03c3cb04b4cbc27 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -86,6 +86,9 @@ class Isolate;
 #define DCHECK_OBJECT_SIZE(size) \
   DCHECK((0 < size) && (size <= Page::kMaxRegularHeapObjectSize))
 
+#define DCHECK_CODEOBJECT_SIZE(size, code_space) \
+  DCHECK((0 < size) && (size <= code_space->AreaSize()))
+
 #define DCHECK_PAGE_OFFSET(offset) \
   DCHECK((Page::kObjectStartOffset <= offset) && (offset <= Page::kPageSize))
 
@@ -840,7 +843,9 @@ class Page : public MemoryChunk {
   // memory. This also applies to new space allocation, since objects are never
   // migrated from new space to large object space. Takes double alignment into
   // account.
-  static const int kMaxRegularHeapObjectSize = kPageSize - kObjectStartOffset;
+  // TODO(hpayer): This limit should be way smaller but we currently have
+  // short living objects >256K.
+  static const int kMaxRegularHeapObjectSize = 600 * KB;
 
   static const int kAllocatableMemory = kPageSize - kObjectStartOffset;