Split StringLiteral from Literal.

src/typing.cc

Index: src/typing.cc
diff --git a/src/typing.cc b/src/typing.cc
index 434aff349055d179256a501d2b18b6a137afaade..fdc4250f7bf7eafe57fa9679cd67cd4349de53b5 100644
--- a/src/typing.cc
+++ b/src/typing.cc
@@ -389,6 +389,16 @@ void AstTyper::VisitLiteral(Literal* expr) {
 }
 
 
+void AstTyper::VisitStringLiteral(StringLiteral* expr) {
+  VisitLiteral(expr);
+}
+
+
+void AstTyper::VisitNumberLiteral(NumberLiteral* expr) {
+  VisitLiteral(expr);
+}
+
+
 void AstTyper::VisitRegExpLiteral(RegExpLiteral* expr) {
   NarrowType(expr, Bounds(Type::RegExp(zone())));
 }
@@ -434,8 +444,8 @@ void AstTyper::VisitAssignment(Assignment* expr) {
     expr->set_is_uninitialized(oracle()->StoreIsUninitialized(id));
     if (!expr->IsUninitialized()) {
       if (prop->key()->IsPropertyName()) {
-        Literal* lit_key = prop->key()->AsLiteral();
-        ASSERT(lit_key != NULL && lit_key->value()->IsString());
+        StringLiteral* lit_key = prop->key()->AsStringLiteral();
+        ASSERT(lit_key != NULL);
         Handle<String> name = Handle<String>::cast(lit_key->value());
         oracle()->AssignmentReceiverTypes(id, name, expr->GetReceiverTypes());
       } else {
@@ -482,9 +492,9 @@ void AstTyper::VisitProperty(Property* expr) {
   expr->set_is_uninitialized(oracle()->LoadIsUninitialized(id));
   if (!expr->IsUninitialized()) {
     if (expr->key()->IsPropertyName()) {
-      Literal* lit_key = expr->key()->AsLiteral();
-      ASSERT(lit_key != NULL && lit_key->value()->IsString());
-      Handle<String> name = Handle<String>::cast(lit_key->value());
+      StringLiteral* lit_key = expr->key()->AsStringLiteral();
+      ASSERT(lit_key != NULL);
+      Handle<String> name = lit_key->string();
       bool is_prototype;
       oracle()->PropertyReceiverTypes(
           id, name, expr->GetReceiverTypes(), &is_prototype);