ARM: Rename the "new_eip" field in NaClThreadContext to "new_prog_ctr"

src/trusted/service_runtime/arch/arm/nacl_switch_to_app_arm.c

 /*
  * Copyright (c) 2012 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.
  */
 
 /*
  * NaCl Service Runtime, C-level context switch code.
  */
 
@@ skipping 14 matching lines @@
 
 NORETURN void NaClStartThreadInApp(struct NaClAppThread *natp,
                                    uint32_t             new_prog_ctr) {
   struct NaClApp  *nap;
   struct NaClThreadContext  *context;
 
   natp->sys.stack_ptr = NaClGetStackPtr() & ~0xf;
 
   nap = natp->nap;
   context = &natp->user;
-  context->new_eip = new_prog_ctr;
+  context->new_prog_ctr = new_prog_ctr;
 
   /*
    * At startup this is not the return value, but the first argument.
    * In the initial thread, it gets the pointer to the information
    * block on the stack.  Additional threads do not expect anything in
    * particular in the first argument register, so we don't bother to
    * conditionalize this.
    */
   context->sysret = context->stack_ptr;
 
@@ skipping 10 matching lines @@
 /*
  * syscall return
  */
 NORETURN void NaClSwitchToApp(struct NaClAppThread *natp,
                               uint32_t             new_prog_ctr) {
   struct NaClApp  *nap;
   struct NaClThreadContext  *context;
 
   nap = natp->nap;
   context = &natp->user;
-  context->new_eip = new_prog_ctr;
+  context->new_prog_ctr = new_prog_ctr;
   context->sysret = natp->sysret;
 
   NaClSwitch(context);
 }