Add flow graph printing into a .cfg file with flag --print-flow-graph-file.

vm/os_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/os.h"
 
 #include <time.h>
 
 #include "platform/assert.h"
 
@@ skipping 159 matching lines @@
 
 
 void OS::Print(const char* format, ...) {
   va_list args;
   va_start(args, format);
   VFPrint(stdout, format, args);
   va_end(args);
 }
 
 
+void OS::FPrint(FILE* stream, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  VFPrint(stream, format, args);
+  va_end(args);
+}
+
+
 void OS::VFPrint(FILE* stream, const char* format, va_list args) {
   vfprintf(stream, format, args);
   fflush(stream);
 }
 
 
 int OS::SNPrint(char* str, size_t size, const char* format, ...) {
   va_list args;
   va_start(args, format);
   int retval = VSNPrint(str, size, format, args);
@@ skipping 21 matching lines @@
   }
   // Make sure to zero-terminate the string if the output was
   // truncated or if there was an error.
   if (written >= size) {
     str[size - 1] = '\0';
   }
   return written;
 }
 
 
+FILE* OS::FOpen(const char* path, const char* mode) {
+  FILE* result;
+  if (fopen_s(&result, path, mode) == 0) return result;
+  return NULL;
+}
+
+
 void OS::PrintErr(const char* format, ...) {
   va_list args;
   va_start(args, format);
   VFPrint(stderr, format, args);
   va_end(args);
 }
 
 
 void OS::InitOnce() {
   // TODO(5411554): For now we check that initonce is called only once,
@@ skipping 14 matching lines @@
 void OS::Abort() {
   abort();
 }
 
 
 void OS::Exit(int code) {
   exit(code);
 }
 
 }  // namespace dart