Change some explicit type checks into using helper functions.

src/assembler_ia32.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 //===- subzero/src/assembler_ia32.h - Assembler for x86-32 ----------------===//
 //
 //                        The Subzero Code Generator
 //
@@ skipping 33 matching lines @@
 enum ScaleFactor { TIMES_1 = 0, TIMES_2 = 1, TIMES_4 = 2, TIMES_8 = 3 };
 
 class DisplacementRelocation : public AssemblerFixup {
 public:
   static DisplacementRelocation *create(Assembler *Asm, FixupKind Kind,
                                         const ConstantRelocatable *Sym) {
     return new (Asm->Allocate<DisplacementRelocation>())
         DisplacementRelocation(Kind, Sym);
   }
 
-  void Process(const MemoryRegion &region, intptr_t position) {
+  void Process(const MemoryRegion &region, intptr_t position) override {
     (void)region;
     (void)position;
     llvm_unreachable("We might not be using this Process() method later.");
   }
 
 private:
   DisplacementRelocation(FixupKind Kind, const ConstantRelocatable *Sym)
       : AssemblerFixup(Kind, Sym) {}
   DisplacementRelocation(const DisplacementRelocation &) LLVM_DELETED_FUNCTION;
   DisplacementRelocation &
@@ skipping 685 matching lines @@
 inline void AssemblerX86::EmitFixup(AssemblerFixup *fixup) {
   buffer_.EmitFixup(fixup);
 }
 
 inline void AssemblerX86::EmitOperandSizeOverride() { EmitUint8(0x66); }
 
 } // end of namespace x86
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ASSEMBLER_IA32_H_