Speed up creation of Objects whose prototype has dictionary elements

This speeds up both the case from the bug (using Object.create) but also
takes care ofthe "{ __proto__: obj  }" syntax, which was previously (and
erroneously) being treated the same as setting the prototype dynamically
from script using the __proto__ setter or Object.setPrototypeOf.

BUG=chromium:422754
LOG=y
R=mvstanton@chromium.org

Review URL: https://codereview.chromium.org/667253002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24814 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/full-codegen-arm.cc

@@ -1760,7 +1760,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         __ push(r0);
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           __ Drop(2);
         }

src/arm64/full-codegen-arm64.cc

@@ -1741,7 +1741,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
           __ Peek(x0, 0);
           __ Push(x0);
           VisitForStackValue(value);
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           VisitForEffect(value);
         }

src/compiler/ast-graph-builder.cc

@@ -942,7 +942,7 @@ void AstGraphBuilder::VisitObjectLiteral(ObjectLiteral* expr) {
         Node* receiver = environment()->Pop();
         if (property->emit_store()) {
           const Operator* op =
-              javascript()->CallRuntime(Runtime::kSetPrototype, 2);
+              javascript()->CallRuntime(Runtime::kInternalSetPrototype, 2);
           NewNode(op, receiver, value);
         }
         break;

src/ia32/full-codegen-ia32.cc

@@ -1686,7 +1686,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         __ push(Operand(esp, 0));  // Duplicate receiver.
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           __ Drop(2);
         }

src/mips/full-codegen-mips.cc

@@ -1746,7 +1746,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         __ push(a0);
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           __ Drop(2);
         }

src/mips64/full-codegen-mips64.cc

@@ -1743,7 +1743,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         __ push(a0);
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           __ Drop(2);
         }

src/objects.cc

@@ -11796,7 +11796,7 @@ MaybeHandle<Object> JSObject::SetPrototype(Handle<JSObject> object,
   DCHECK(new_map->prototype() == *value);
   JSObject::MigrateToMap(real_receiver, new_map);
 
-  if (!dictionary_elements_in_chain &&
+  if (from_javascript && !dictionary_elements_in_chain &&
       new_map->DictionaryElementsInPrototypeChainOnly()) {
     // If the prototype chain didn't previously have element callbacks, then
     // KeyedStoreICs need to be cleared to ensure any that involve this

src/x64/full-codegen-x64.cc

@@ -1720,7 +1720,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         __ Push(Operand(rsp, 0));  // Duplicate receiver.
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           __ Drop(2);
         }

src/x87/full-codegen-x87.cc

@@ -1675,7 +1675,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
         __ push(Operand(esp, 0));  // Duplicate receiver.
         VisitForStackValue(value);
         if (property->emit_store()) {
-          __ CallRuntime(Runtime::kSetPrototype, 2);
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
         } else {
           __ Drop(2);
         }

test/mjsunit/fast-prototype.js

@@ -114,9 +114,9 @@ for (key in x) {
   assertTrue(key == 'a');
   break;
 }
-assertFalse(%HasFastProperties(x));
+assertTrue(%HasFastProperties(x));
 x.d = 4;
-assertFalse(%HasFastProperties(x));
+assertTrue(%HasFastProperties(x));
 for (key in x) {
   assertTrue(key == 'a');
   break;