[heap] make inline-allocation-observers precise

src/heap/spaces.cc

Index: src/heap/spaces.cc
diff --git a/src/heap/spaces.cc b/src/heap/spaces.cc
index eeaf39aedc6838ffb7d92c91c05d4cadf29dd861..6db43fb47d76414e838840acffa98bcbd293b47e 100644
--- a/src/heap/spaces.cc
+++ b/src/heap/spaces.cc
@@ -1516,7 +1516,7 @@ void NewSpace::UpdateInlineAllocationLimit(int size_in_bytes) {
     // Lower limit during incremental marking.
     Address high = to_space_.page_high();
     Address new_top = allocation_info_.top() + size_in_bytes;
-    Address new_limit = new_top + GetNextInlineAllocationStepSize();
+    Address new_limit = new_top + GetNextInlineAllocationStepSize() - 1;
     allocation_info_.set_limit(Min(new_limit, high));
   }
   DCHECK_SEMISPACE_ALLOCATION_INFO(allocation_info_, to_space_);