[torque] change formatter to emit LF newlines on Windows

Otherwise, it will always replace LF with CRLF, which is not what you
want if you follow the Chromium instructions for Windows, that is,
configure git with core.autocrlf = false.

Change-Id: I30fcfc471cde79d5c80d05ce582a8507cf5810b5
Reviewed-on: https://chromium-review.googlesource.com/c/1345150Reviewed-by: Daniel Clifford <danno@chromium.org>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57691}

tools/torque/format-torque.py

@@ -9,6 +9,7 @@ the source and header files directly in V8's src directory."""
 import subprocess
 import sys
 import re
+import io
 from subprocess import Popen, PIPE
 
 def preprocess(input):
@@ -82,13 +83,13 @@ def postprocess(output):
   return output
 
 def process(filename, only_lint, use_stdout):
-  with open(filename, 'r') as content_file:
+  with io.open(filename, 'r') as content_file:
     content = content_file.read()
 
   original_input = content
 
   p = Popen(['clang-format', '-assume-filename=.ts'], stdin=PIPE, stdout=PIPE, stderr=PIPE)
-  output, err = p.communicate(preprocess(content))
+  output, err = p.communicate(preprocess(content).encode('utf-8'))
   output = postprocess(output)
   rc = p.returncode
   if (rc <> 0):
@@ -101,8 +102,8 @@ def process(filename, only_lint, use_stdout):
   elif use_stdout:
     print output
   else:
-    output_file = open(filename, 'w')
-    output_file.write(output);
+    output_file = io.open(filename, 'w', newline="\n")
+    output_file.write(output.decode('utf-8'));
     output_file.close()
 
 def print_usage():