Fix race condition in jump table list creation

src/IceGlobalContext.cpp

 //===- subzero/src/IceGlobalContext.cpp - Global context defs -------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 877 matching lines @@
     // Create a random number generator for jump tables reordering, considering
     // jump tables as pooled constants.
     RandomNumberGenerator RNG(getFlags().getRandomSeed(),
                               RPE_PooledConstantReordering);
     RandomShuffle(JumpTables.begin(), JumpTables.end(),
                   [&RNG](uint64_t N) { return (uint32_t)RNG.next(N); });
   }
   return JumpTables;
 }
 
-JumpTableData &GlobalContext::addJumpTable(IceString FuncName, SizeT Id,
-                                           SizeT NumTargets) {
+JumpTableData &
+GlobalContext::addJumpTable(IceString FuncName, SizeT Id,
+                            const JumpTableData::TargetList &TargetList) {
   auto JumpTableList = getJumpTableList();
-  JumpTableList->emplace_back(FuncName, Id, NumTargets);
+  JumpTableList->emplace_back(FuncName, Id, TargetList);
   return JumpTableList->back();
 }
 
 TimerStackIdT GlobalContext::newTimerStackID(const IceString &Name) {
   if (!BuildDefs::dump())
     return 0;
   auto Timers = getTimers();
   TimerStackIdT NewID = Timers->size();
   Timers->push_back(TimerStack(Name));
   return NewID;
@@ skipping 96 matching lines @@
   Ctx = Func->getContext();
   Active =
       Func->getFocusedTiming() || Ctx->getFlags().getSubzeroTimingEnabled();
   if (Active)
     Ctx->pushTimer(ID, StackID);
 }
 
 ICE_TLS_DEFINE_FIELD(GlobalContext::ThreadContext *, GlobalContext, TLS);
 
 } // end of namespace Ice