Added backend for SPIR

llvm/lib/Transforms/DFG2LLVM_SPIR/CMakeLists.txt

+add_llvm_loadable_module( LLVMDFG2LLVM_SPIR
+  DFG2LLVM_SPIR.cpp
+  )

llvm/lib/Transforms/DFG2LLVM_SPIR/Makefile

+##===- lib/Transforms/BuildDFG/Makefile -----------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../../../
+LIBRARYNAME = LLVMDFG2LLVM_SPIR
+LOADABLE_MODULE = 1
+CXXFLAGS+= -Wno-c++11-extensions
+#SHARED_LIBRARY = 1
+#BUILD_ARCHIVE = 1
+#USEDLIBS =
+
+include $(LEVEL)/Makefile.common