Fix race condition in jump table list creation

src/IceGlobalContext.h

Index: src/IceGlobalContext.h
diff --git a/src/IceGlobalContext.h b/src/IceGlobalContext.h
index e4b14409c0d48475b343cbef1e3b8afc636560f6..11e0daad609e72dbf3c24048a0b6fe870383641c 100644
--- a/src/IceGlobalContext.h
+++ b/src/IceGlobalContext.h
@@ -217,7 +217,8 @@ public:
   /// Return a locked pointer to the registered jump tables.
   JumpTableDataList getJumpTables();
   /// Create a new jump table entry and return a reference to it.
-  JumpTableData &addJumpTable(IceString FuncName, SizeT Id, SizeT NumTargets);
+  JumpTableData &addJumpTable(IceString FuncName, SizeT Id,
+                              const JumpTableData::TargetList &TargetList);
 
   const ClFlags &getFlags() const { return Flags; }