Remove Emscripten support

lib/Target/JSBackend/OptPasses.h

Index: lib/Target/JSBackend/OptPasses.h
diff --git a/lib/Target/JSBackend/OptPasses.h b/lib/Target/JSBackend/OptPasses.h
deleted file mode 100644
index 44892cf907e0bf13530a058b7b3bb12e516ddad0..0000000000000000000000000000000000000000
--- a/lib/Target/JSBackend/OptPasses.h
+++ /dev/null
@@ -1,21 +0,0 @@
-//===-- JSTargetMachine.h - TargetMachine for the JS Backend ---*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===---------------------------------------------------------------------===//
-
-#ifndef OPT_PASSES_H
-#define OPT_PASSES_H
-
-#include "llvm/Pass.h"
-
-namespace llvm {
-
-  extern FunctionPass *createEmscriptenSimplifyAllocasPass();
-
-} // End llvm namespace
-
-#endif