Change startup ABI for untrusted code to be C-compatible

src/untrusted/irt/elf_restart_arm.S

Index: src/untrusted/irt/elf_restart_arm.S
diff --git a/src/untrusted/irt/elf_restart_arm.S b/src/untrusted/irt/elf_restart_arm.S
deleted file mode 100644
index d81c52bc4d43b3e5eda14da825965c959e15343d..0000000000000000000000000000000000000000
--- a/src/untrusted/irt/elf_restart_arm.S
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * 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.
- */
-
-/*
- * The ELF entry point ABI is such that assembly code is required to
- * call the entry point.
- * See http://code.google.com/p/nativeclient/issues/detail?id=1131
- */
-
-#include "native_client/src/trusted/service_runtime/nacl_config.h"
-
-        /*
-         * arg 1:  r0, new stack pointer
-         * arg 2:  r1, entry point
-         * arg 3:  r2, atexit function, to be left in r0
-         */
-        .global jump_to_elf_start
-jump_to_elf_start:
-        mov sp, r0
-        bic sp, sp, #NACL_DATA_FLOW_MASK
-
-        mov r0, r2
-        nop
-
-        bic r1, r1, #NACL_CONTROL_FLOW_MASK
-        bx r1