Parser & internalization fix: ensure no heap allocs during GetString(Handle<String>).

src/ast-value-factory.h

Index: src/ast-value-factory.h
diff --git a/src/ast-value-factory.h b/src/ast-value-factory.h
index 071ca9ce9cc18abf23e17f09c31e69ca69a8ccce..b8fc30a77c564fe67deaaf9c081006f22787ff37 100644
--- a/src/ast-value-factory.h
+++ b/src/ast-value-factory.h
@@ -327,8 +327,8 @@ class AstValueFactory {
   const AstValue* NewTheHole();
 
  private:
-  const AstRawString* GetString(uint32_t hash, bool is_one_byte,
-                                Vector<const byte> literal_bytes);
+  AstRawString* GetString(uint32_t hash, bool is_one_byte,
+                          Vector<const byte> literal_bytes);
 
   // All strings are copied here, one after another (no NULLs inbetween).
   HashMap string_table_;