Revert of Build the IRT with nacl-clang for x86

src/untrusted/irt/frame_info_stubs.c

Index: src/untrusted/irt/frame_info_stubs.c
diff --git a/src/untrusted/irt/frame_info_stubs.c b/src/untrusted/irt/frame_info_stubs.c
deleted file mode 100644
index a0849a487dfc0ed687e209ebe4b51a02e51b2a5b..0000000000000000000000000000000000000000
--- a/src/untrusted/irt/frame_info_stubs.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Copyright (c) 2015 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.
- */
-
-/*
- * On x86-64 we build the IRT with sandbox base-address hiding. This means that
- * all of its components must be built with LLVM's assembler. Currently the
- * unwinder library is built with nacl-gcc and so does not use base address
- * hiding. The IRT does not use exceptions, so we do not actually need the
- * unwinder at all. To prevent it from being linked into the IRT, we provide
- * stub implementations of its functions that are referenced from crtbegin.c.
- */
-
-void __register_frame_info(void *begin, void *ob) {}
-void __deregister_frame_info(const void *begin) {}