Fix missing static cast on Windows.

src/regexp-macro-assembler-tracer.cc

 // Copyright 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 187 matching lines @@
 }
 
 
 class PrintablePrinter {
  public:
   explicit PrintablePrinter(uc16 character) : character_(character) { }
 
   const char* operator*() {
     if (character_ >= ' ' && character_ <= '~') {
       buffer_[0] = '(';
-      buffer_[1] = character_;
+      buffer_[1] = static_cast<char>(character_);
       buffer_[2] = ')';
       buffer_[3] = '\0';
     } else {
       buffer_[0] = '\0';
     }
     return &buffer_[0];
   };
 
  private:
   uc16 character_;
@@ skipping 230 matching lines @@
   return assembler_->Implementation();
 }
 
 
 Handle<HeapObject> RegExpMacroAssemblerTracer::GetCode(Handle<String> source) {
   PrintF(" GetCode(%s);\n", *(source->ToCString()));
   return assembler_->GetCode(source);
 }
 
 }}  // namespace v8::internal