Change BKPT and UDF encodings on ARM.

src/trusted/service_runtime/arch/arm/nacl_text_pad_test.S

 /*
  * Copyright (c) 2011 The Native Client Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
+#include "native_client/src/include/arm_sandbox.h"
 #include "native_client/src/trusted/service_runtime/include/bits/nacl_syscalls.h"
 #include "native_client/src/trusted/service_runtime/nacl_config.h"
 
-#define halt 0xe1266676
 /* the macros below are used with movw/movt and absolute values */
 /* llvm-mc does not like the use of :lower16:/:upper16: with absolute values */
 /* c.f.: http://llvm.org/bugs/show_bug.cgi?id=8721 */
 #define lower_16(x) ((x) & 0xffff)
 #define upper_16(x) (((x) >> 16) & 0xffff)
 
 
         /*
          * Code to test various address layout boundary conditions.
          * This is a translation from the x86-{32,64} code, and is
@@ skipping 197 matching lines @@
         nop
 
         nop
         nop
         bic r3, r3, #0xc000000f
         blx r3
 #if defined(PNACL_AS)
 /* NOTE: unlike x86 the alignment directive on ARM takes
    the logarithm of the alignment */
 #define POW2_BIGGER_THAN_DOT 14
-        .align32 POW2_BIGGER_THAN_DOT, halt
-        .fill (TEXT_EXTEND - (1 << POW2_BIGGER_THAN_DOT))/4, 4, halt
+        .align32 POW2_BIGGER_THAN_DOT, NACL_INSTR_HALT_FILL
+        .fill (TEXT_EXTEND - (1 << POW2_BIGGER_THAN_DOT))/4, 4, \
+              NACL_INSTR_HALT_FILL
 #else
-        .fill (TEXT_EXTEND - (. - start_of_text))/4, 4, halt
+        .fill (TEXT_EXTEND - (. - start_of_text))/4, 4, NACL_INSTR_HALT_FILL
 #endif
 
 end_of_text:
 
 #if defined(EXPECTED_RODATA)
         .section .rodata
 ro_str: .ascii "Hello world\n"
         /*      123456789012 */
 #endif