Change constant pool marker to be the unconditional, permanently undefined instruction.

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 1311 matching lines @@
   static int GetCmpImmediateRawImmediate(Instr instr);
   static bool IsNop(Instr instr, int type = NON_MARKING_NOP);
   static bool IsMovT(Instr instr);
   static bool IsMovW(Instr instr);
 
   // Constants in pools are accessed via pc relative addressing, which can
   // reach +/-4KB thereby defining a maximum distance between the instruction
   // and the accessed constant.
   static const int kMaxDistToPool = 4*KB;
   static const int kMaxNumPendingRelocInfo = kMaxDistToPool/kInstrSize;
+  STATIC_ASSERT((kConstantPoolLengthMaxMask & kMaxNumPendingRelocInfo) ==
+                kMaxNumPendingRelocInfo);
 
   // Postpone the generation of the constant pool for the specified number of
   // instructions.
   void BlockConstPoolFor(int instructions);
 
   // Check if is time to emit a constant pool.
   void CheckConstPool(bool force_emit, bool require_jump);
 
  protected:
   // Relocation for a type-recording IC has the AST id added to it.  This
@@ skipping 186 matching lines @@
 
  private:
   Assembler* asm_;
   bool old_value_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_