[interpreter] Use hashmap for ConstantArrayBuilder's constant map

src/interpreter/constant-array-builder.cc

Index: src/interpreter/constant-array-builder.cc
diff --git a/src/interpreter/constant-array-builder.cc b/src/interpreter/constant-array-builder.cc
index ff3823fde2d14ce96bbc135ac00ad11cd765c5d5..e5ccb386b0f621154bbd2bb266d3130ea4c672f1 100644
--- a/src/interpreter/constant-array-builder.cc
+++ b/src/interpreter/constant-array-builder.cc
@@ -72,7 +72,7 @@ STATIC_CONST_MEMBER_DEFINITION const size_t
 
 ConstantArrayBuilder::ConstantArrayBuilder(Zone* zone,
                                            Handle<Object> the_hole_value)
-    : constants_map_(zone),
+    : constants_map_(zone, 16),
       smi_map_(zone),
       smi_pairs_(zone),
       the_hole_value_(the_hole_value) {
@@ -153,9 +153,8 @@ Handle<FixedArray> ConstantArrayBuilder::ToFixedArray(Isolate* isolate) {
 }
 
 size_t ConstantArrayBuilder::Insert(Handle<Object> object) {
-  auto entry = constants_map_.find(object.address());
-  return (entry == constants_map_.end()) ? AllocateEntry(object)
-                                         : entry->second;
+  return constants_map_.LookupOrInsert(object.address(),
+                                       [&]() { return AllocateIndex(object); });
 }
 
 ConstantArrayBuilder::index_t ConstantArrayBuilder::AllocateEntry(