Move make_clang_dir handling later so --print-revision works

tools/clang/scripts/update.py

Index: tools/clang/scripts/update.py
diff --git a/tools/clang/scripts/update.py b/tools/clang/scripts/update.py
index f695ad4681a4b8309793ae69e5d8ddf2bf1f23ee..20c003df2b1599db409b23c1f4b439610fd9edae 100755
--- a/tools/clang/scripts/update.py
+++ b/tools/clang/scripts/update.py
@@ -713,9 +713,6 @@ def main():
 
   args = parser.parse_args()
 
-  if re.search(r'\b(make_clang_dir)=', os.environ.get('GYP_DEFINES', '')):
-    print 'Skipping Clang update (make_clang_dir= was set in GYP_DEFINES).'
-    return 0
   if args.if_needed:
     is_clang_required = False
     # clang is always used on Mac and Linux.
@@ -740,6 +737,10 @@ def main():
       print PACKAGE_VERSION
     return 0
 
+  if re.search(r'\b(make_clang_dir)=', os.environ.get('GYP_DEFINES', '')):
+    print 'Skipping Clang update (make_clang_dir= was set in GYP_DEFINES).'
+    return 0
+
   # Don't buffer stdout, so that print statements are immediately flushed.
   # Do this only after --print-revision has been handled, else we'll get
   # an error message when this script is run from gn for some reason.