Bug 1377651 Make vtune variable non-static so it may be used in a non-static function r=sstangl

MozReview-Commit-ID: IlpSsMH7mq0

--HG--
extra : rebase_source : 58deeaba9ae5ddd3672d03e505840f01483f505b

js/src/vtune/README

@@ -14,6 +14,8 @@ Additionally, the following changes should be propagated:
       or Ubuntu shell builds will randomly crash on startup.
     - With weak attributes removed, DL_SYMBOLS and PTHREAD_SYMBOLS should
       be defined as "(1)" to avoid -Waddress warnings.
+    - Per Bug 1377651, the __itt_null variable in ittnotify.h should be
+      made non-static, so it can be used in a non-static function.
 
 If the license has changed, update the "VTune License" section of
     toolkit/content/license.html

js/src/vtune/ittnotify.h

@@ -1812,7 +1812,7 @@ typedef struct ___itt_id
 #pragma pack(pop)
 /** @endcond */
 
-static const __itt_id __itt_null = { 0, 0, 0 };
+const __itt_id __itt_null = { 0, 0, 0 };
 
 /**
  * @ingroup ids