Change startup ABI for untrusted code to be C-compatible

src/untrusted/irt/elf_restart_x86_32.S

Index: src/untrusted/irt/elf_restart_x86_32.S
diff --git a/src/untrusted/irt/elf_restart_x86_32.S b/src/untrusted/irt/elf_restart_x86_32.S
deleted file mode 100644
index a97a367ab1ff9aea741bd2d9f8c5f35ca264eaf5..0000000000000000000000000000000000000000
--- a/src/untrusted/irt/elf_restart_x86_32.S
+++ /dev/null
@@ -1,23 +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
- */
-
-        /*
-         * arg 1:  4(%esp), new stack pointer
-         * arg 2:  8(%esp), entry point
-         * arg 3:  12(%esp), atexit function, to be left in %edx
-         */
-        .global jump_to_elf_start
-jump_to_elf_start:
-        mov 12(%esp), %edx
-        mov 8(%esp), %eax
-        mov 4(%esp), %esp
-        nacljmp %eax