Remove "unused" member ModuleSlice from `struct OpenMPOpt`

[mehdi_amini]

Summary

This is fixing warning from clang:

warning: private field 'ModuleSlice' is not used [-Wunused-private-field]

SmallPtrSetImpl<Function *> &ModuleSlice;
                             ^

[sstefan1]

This was my bad. Thanks for noticing!

llvm/lib/Transforms/IPO/OpenMPOpt.cpp

271

This can now be OMPInfoCache.ModuleSlice.size()

llvm/lib/Transforms/IPO/OpenMPOpt.cpp

 struct OpenMPOpt {
 
   using OptimizationRemarkGetter =
       function_ref<OptimizationRemarkEmitter &(Function *)>;
 
   OpenMPOpt(SmallVectorImpl<Function *> &SCC, CallGraphUpdater &CGUpdater,
             OptimizationRemarkGetter OREGetter,
             OMPInformationCache &OMPInfoCache)
-      : M(*(*SCC.begin())->getParent()), SCC(SCC),
-        ModuleSlice(OMPInfoCache.ModuleSlice), CGUpdater(CGUpdater),
+      : M(*(*SCC.begin())->getParent()), SCC(SCC), CGUpdater(CGUpdater),
         OREGetter(OREGetter), OMPInfoCache(OMPInfoCache) {}
 
   /// Run all OpenMP optimizations on the underlying SCC/ModuleSlice.
   bool run() {
     bool Changed = false;
 
     LLVM_DEBUG(dbgs() << TAG << "Run on SCC with " << SCC.size()
-                      << " functions in a slice with " << ModuleSlice.size()
-                      << " functions\n");
+                      << " functions in a slice with "
+                      << OMPInfoCache.ModuleSlice.size() << " functions\n");
 
     Changed |= deduplicateRuntimeCalls();
     Changed |= deleteParallelRegions();
 
     return Changed;
   }
 
   /// Return the call if \p U is a callee use in a regular call. If \p RFI is
private:
   }
 
   /// The underyling module.
   Module &M;
 
   /// The SCC we are operating on.
   SmallVectorImpl<Function *> &SCC;
 
-  /// The slice of the module we are allowed to look at.
-  SmallPtrSetImpl<Function *> &ModuleSlice;
-
   /// Callback to update the call graph, the first argument is a removed call,
   /// the second an optional replacement call.
   CallGraphUpdater &CGUpdater;
 
   /// Callback to get an OptimizationRemarkEmitter from a Function *
   OptimizationRemarkGetter OREGetter;
 
   /// OpenMP-specific information cache. Also Used for Attributor runs.