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

src/trusted/service_runtime/arch/x86_32/sel_rt_32.h

 /*
  * 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 Secure Runtime
  */
 
@@ skipping 80 matching lines @@
   /*          22 */
   uint16_t    sys_fcw;
   /*          24 */
   char        dummy[2];
   /*
    * gs is our TLS base in the app; on the host side it's either fs or gs.
    */
   uint16_t    ds, es, fs, gs;
   /*          28  2a  2c  2e */
   /*
-   * spring_addr, sys_ret and new_eip are not a part of the thread's
-   * register set, but are needed by NaClSwitch. By including them
-   * here, the two use the same interface.
+   * spring_addr, sys_ret and new_prog_ctr are not a part of the
+   * thread's register set, but are needed by NaClSwitch.  By
+   * including them here, the two use the same interface.
    */
   nacl_reg_t  new_prog_ctr;
   /*          30 */
   nacl_reg_t  sysret;
   /*          34 */
   nacl_reg_t  spring_addr;
   /*          38 */
   uint16_t    cs; /* spring_addr and cs must be adjacent */
   /*          3c */
 };
 
 #endif /* __NATIVE_CLIENT_SERVICE_RUNTIME_ARCH_X86_32_SEL_RT_32_H__ */