Have assertion macro and FATAL() text ask user to file a bug, provide URL to do so.

Switch to Assert() from assert() to make it clear it's not the C stdlib one we're
using any more.

main.cpp

@@ -167,10 +167,12 @@ int main(int Argc, char *Argv[]) {
     char *argv[128];
     lGetAllArgs(Argc, Argv, argc, argv);
 
+#if 0
     // Use LLVM's little utility function to print out nice stack traces if
     // we crash
     llvm::sys::PrintStackTraceOnErrorSignal();
     llvm::PrettyStackTraceProgram X(argc, argv);
+#endif
 
     // initialize available LLVM targets
     LLVMInitializeX86TargetInfo();