Revert of [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 6b0e38e93fd3b2da98c37f1a90205020046bb5c5..69a8d89fccba5c5aa06f91d2a1995870b70ef033 100644
--- a/src/heap/spaces.h
+++ b/src/heap/spaces.h
@@ -86,9 +86,6 @@
 #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))
 
@@ -843,7 +840,7 @@
   // 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 = 128 * KB * (i::kPointerSize / 4);
+  static const int kMaxRegularHeapObjectSize = kPageSize - kObjectStartOffset;
 
   static const int kAllocatableMemory = kPageSize - kObjectStartOffset;