Removing SPIR backend from this branch

hpvm/lib/Transforms/CMakeLists.txt

 add_subdirectory(BuildDFG)
 add_subdirectory(ClearDFG)
 add_subdirectory(DFG2LLVM_NVPTX)
-#add_subdirectory(DFG2LLVM_SPIR)
 add_subdirectory(DFG2LLVM_X86)
 add_subdirectory(GenVISC)
 add_subdirectory(LocalMem)

hpvm/lib/Transforms/DFG2LLVM_SPIR/CMakeLists.txt

-if(WIN32 OR CYGWIN)
-  set(LLVM_LINK_COMPONENTS Core Support)
-endif()
-
-add_llvm_library( LLVMDFG2LLVM_SPIR
-  MODULE
-  DFG2LLVM_SPIR.cpp
-
-  DEPENDS
-  intrinsics_gen
-  PLUGIN_TOOL
-  opt
-  )

hpvm/lib/Transforms/DFG2LLVM_SPIR/LLVMBuild.txt

-;===- ./lib/Transforms/DFG2LLVM_SPIR/LLVMBuild.txt -------------*- Conf -*--===;
-;
-;                     The LLVM Compiler Infrastructure
-;
-; This file is distributed under the University of Illinois Open Source
-; License. See LICENSE.TXT for details.
-;
-;===------------------------------------------------------------------------===;
-;
-; This is an LLVMBuild description file for the components in this subdirectory.
-;
-; For more information on the LLVMBuild system, please see:
-;
-;   http://llvm.org/docs/LLVMBuild.html
-;
-;===------------------------------------------------------------------------===;
-
-[component_0]
-type = Library
-name = DFG2LLVM_SPIR
-parent = Transforms