More efficient use of space in AllocationSite.

src/code-stubs-hydrogen.cc

Index: src/code-stubs-hydrogen.cc
diff --git a/src/code-stubs-hydrogen.cc b/src/code-stubs-hydrogen.cc
index 783384d45285f3e5325038a34ea6d3705e45042e..e60444a7c3e6437882282b80e0e455563cf9a0f6 100644
--- a/src/code-stubs-hydrogen.cc
+++ b/src/code-stubs-hydrogen.cc
@@ -491,20 +491,16 @@ HValue* CodeStubGraphBuilder<CreateAllocationSiteStub>::BuildCodeStub() {
                             AllocationSite::kNestedSiteOffset),
                         graph()->GetConstant0());
 
-  // Pretenuring calculation fields.
+  // Pretenuring calculation field.
   Add<HStoreNamedField>(object,
                         HObjectAccess::ForAllocationSiteOffset(
-                            AllocationSite::kMementoFoundCountOffset),
+                            AllocationSite::kPretenureDataOffset),
                         graph()->GetConstant0());
 
+  // Pretenuring memento creation count field.
   Add<HStoreNamedField>(object,
                         HObjectAccess::ForAllocationSiteOffset(
-                            AllocationSite::kMementoCreateCountOffset),
-                        graph()->GetConstant0());
-
-  Add<HStoreNamedField>(object,
-                        HObjectAccess::ForAllocationSiteOffset(
-                            AllocationSite::kPretenureDecisionOffset),
+                            AllocationSite::kPretenureCreateCountOffset),
                         graph()->GetConstant0());
 
   // Store an empty fixed array for the code dependency.