Subzero: Use a "known" version of clang-format.

src/IceGlobalContext.h

Index: src/IceGlobalContext.h
diff --git a/src/IceGlobalContext.h b/src/IceGlobalContext.h
index dfa665b25da23ce2475040899d89143153363934..ac321e68860704d746e07f75b322c9e4adfc11df 100644
--- a/src/IceGlobalContext.h
+++ b/src/IceGlobalContext.h
@@ -209,11 +209,7 @@ public:
   }
 
   // These are predefined TimerStackIdT values.
-  enum TimerStackKind {
-    TSK_Default = 0,
-    TSK_Funcs,
-    TSK_Num
-  };
+  enum TimerStackKind { TSK_Default = 0, TSK_Funcs, TSK_Num };
 
   TimerStackIdT newTimerStackID(const IceString &Name);
   TimerIdT getTimerID(TimerStackIdT StackID, const IceString &Name);