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

src/trusted/service_runtime/arch/arm/sel_rt.h

Index: src/trusted/service_runtime/arch/arm/sel_rt.h
diff --git a/src/trusted/service_runtime/arch/arm/sel_rt.h b/src/trusted/service_runtime/arch/arm/sel_rt.h
index 94c0eab618da5975322b8967cdddd5e161c02795..bfa7a8ad3137346473641ed8fa9aad78026f2dcb 100644
--- a/src/trusted/service_runtime/arch/arm/sel_rt.h
+++ b/src/trusted/service_runtime/arch/arm/sel_rt.h
@@ -33,13 +33,13 @@ struct NaClThreadContext {
   nacl_reg_t  r4, r5, r6, r7, r8, r9, r10, fp, stack_ptr, prog_ctr;
   /*           0   4   8   c  10  14   18  1c         20        24 */
   /*
-   * 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.
+   * 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.
    */
   uint32_t  sysret;
   /*            28 */
-  uint32_t  new_eip;
+  uint32_t  new_prog_ctr;
   /*            2c */
   uint32_t  tls_idx;
   /*            30 */