Extract hardcoded error strings into a single place and replace them with enum.

src/ia32/deoptimizer-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 607 matching lines @@
 
   if (type() != OSR) {
     // If frame was dynamically aligned, pop padding.
     Label no_padding;
     __ cmp(Operand(eax, Deoptimizer::has_alignment_padding_offset()),
            Immediate(0));
     __ j(equal, &no_padding);
     __ pop(ecx);
     if (FLAG_debug_code) {
       __ cmp(ecx, Immediate(kAlignmentZapValue));
-      __ Assert(equal, "alignment marker expected");
+      __ Assert(equal, kAlignmentMarkerExpected);
     }
     __ bind(&no_padding);
   } else {
     // If frame needs dynamic alignment push padding.
     Label no_padding;
     __ cmp(Operand(eax, Deoptimizer::has_alignment_padding_offset()),
            Immediate(0));
     __ j(equal, &no_padding);
     __ push(Immediate(kAlignmentZapValue));
     __ bind(&no_padding);
@@ skipping 79 matching lines @@
   SetFrameSlot(offset, value);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32