Fix compile failure with very strict gcc warning rules on Linux....

src/variables.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 70 matching lines @@
   // PrintF("r = %d, w = %d", nreads_, nwrites_);
   PrintF("%du = %dr + %dw", nuses(), nreads(), nwrites());
 }
 #endif
 
 
 // ----------------------------------------------------------------------------
 // Implementation StaticType.
 
 
-char* StaticType::Type2String(StaticType* type) {
+const char* StaticType::Type2String(StaticType* type) {
   switch (type->kind_) {
     case UNKNOWN:
       return "UNKNOWN";
     case LIKELY_SMI:
       return "LIKELY_SMI";
     default:
       UNREACHABLE();
   }
   return "UNREACHABLE";
 }
@@ skipping 49 matching lines @@
 
 
 bool Variable::is_global() const {
   // Temporaries are never global, they must always be allocated in the
   // activation frame.
   return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope();
 }
 
 
 } }  // namespace v8::internal