[Beignet] [PATCH] Fix build errors in llvm3.5 only system.

[Yang Rong]

There are some head files miss if have llvm3.5 only. If has previous llvm, even uninstall,
will still remain these head files in system, so can't trigger it.

Signed-off-by: Yang Rong <rong.r.yang at intel.com>
---
 backend/src/llvm/llvm_gen_backend.cpp | 6 ++++++
 backend/src/llvm/llvm_passes.cpp      | 6 ++++++
 backend/src/llvm/llvm_to_gen.cpp      | 5 +++--
 3 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/backend/src/llvm/llvm_gen_backend.cpp b/backend/src/llvm/llvm_gen_backend.cpp
index a9c08bf..2d4fb0a 100644
--- a/backend/src/llvm/llvm_gen_backend.cpp
+++ b/backend/src/llvm/llvm_gen_backend.cpp
@@ -105,7 +105,13 @@
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/IntrinsicLowering.h"
+
+#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >=5
+#include "llvm/IR/Mangler.h"
+#else
 #include "llvm/Target/Mangler.h"
+#endif
+
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
diff --git a/backend/src/llvm/llvm_passes.cpp b/backend/src/llvm/llvm_passes.cpp
index 1091dae..d30a570 100644
--- a/backend/src/llvm/llvm_passes.cpp
+++ b/backend/src/llvm/llvm_passes.cpp
@@ -64,7 +64,13 @@
 #include "llvm/Analysis/ValueTracking.h"
 #include "llvm/CodeGen/Passes.h"
 #include "llvm/CodeGen/IntrinsicLowering.h"
+
+#if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >=5
+#include "llvm/IR/Mangler.h"
+#else
 #include "llvm/Target/Mangler.h"
+#endif
+
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCContext.h"
diff --git a/backend/src/llvm/llvm_to_gen.cpp b/backend/src/llvm/llvm_to_gen.cpp
index 62d6f13..8b2ac04 100644
--- a/backend/src/llvm/llvm_to_gen.cpp
+++ b/backend/src/llvm/llvm_to_gen.cpp
@@ -34,7 +34,6 @@
 #endif  /* LLVM_VERSION_MINOR <= 2 */
 #include "llvm/PassManager.h"
 #include "llvm/Pass.h"
-#include "llvm/Analysis/Verifier.h"
 #include "llvm/Analysis/Passes.h"
 #include "llvm/Transforms/IPO.h"
 #include "llvm/Target/TargetLibraryInfo.h"
@@ -47,11 +46,13 @@
 #endif  /* LLVM_VERSION_MINOR <= 2 */
 #include "llvm/Support/raw_ostream.h"
 #include "llvm/Transforms/Scalar.h"
-#include "llvm/Assembly/PrintModulePass.h"
 
 #if LLVM_VERSION_MAJOR == 3 && LLVM_VERSION_MINOR >=5
 #include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/Verifier.h"
+#else
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Assembly/PrintModulePass.h"
 #endif
 
 #include "llvm/llvm_gen_backend.hpp"
-- 
1.8.3.2