eliminate code related to --no-ir-gen

src/IceGlobalContext.h

 //===- subzero/src/IceGlobalContext.h - Global context defs -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 204 matching lines @@
   /// @}
 
   /// 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,
                               const JumpTableData::TargetList &TargetList);
 
   const ClFlags &getFlags() const { return Flags; }
 
-  bool isIRGenerationDisabled() const {
-    return getFlags().getDisableIRGeneration();
-  }
-
   /// Allocate data of type T using the global allocator. We allow entities
   /// allocated from this global allocator to be either trivially or
   /// non-trivially destructible. We optimize the case when T is trivially
   /// destructible by not registering a destructor. Destructors will be invoked
   /// during GlobalContext destruction in the reverse object creation order.
   template <typename T>
   typename std::enable_if<std::is_trivially_destructible<T>::value, T>::type *
   allocate() {
     return getAllocator()->Allocate<T>();
   }
@@ skipping 363 matching lines @@
   explicit OstreamLocker(GlobalContext *Ctx) : Ctx(Ctx) { Ctx->lockStr(); }
   ~OstreamLocker() { Ctx->unlockStr(); }
 
 private:
   GlobalContext *const Ctx;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H