Fix race condition in jump table list creation

src/IceGlobalContext.cpp

Index: src/IceGlobalContext.cpp
diff --git a/src/IceGlobalContext.cpp b/src/IceGlobalContext.cpp
index fbdcd1bcc4e13f24bf5eaeaa4490f0d5754ed02a..7c6daafdfad6d5d7569f9af5fbd24fa5f626bc3c 100644
--- a/src/IceGlobalContext.cpp
+++ b/src/IceGlobalContext.cpp
@@ -896,9 +896,10 @@ JumpTableDataList GlobalContext::getJumpTables() {
 }
 
 JumpTableData &GlobalContext::addJumpTable(IceString FuncName, SizeT Id,
-                                           SizeT NumTargets) {
+                                           const JumpTableData::TargetList
+                                           &TargetList) {
   auto JumpTableList = getJumpTableList();
-  JumpTableList->emplace_back(FuncName, Id, NumTargets);
+  JumpTableList->emplace_back(FuncName, Id, TargetList);
   return JumpTableList->back();
 }