[Beignet] [PATCH] GBE: Fix type size for vector3

[Ruiling Song]

According to OCL spec, size of vector3 are aligned to vector4.
And for memory load/store, clang already aligned it to vector4.
If we do not calculate private/local memory size as vector4,
out of range memory access will appear.

This can fix the failure of opencv 3.0 case:
OCL_Arithm/MeanStdDev.Mat_Mask

Signed-off-by: Ruiling Song <ruiling.song at intel.com>
---
 backend/src/llvm/llvm_passes.cpp |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/backend/src/llvm/llvm_passes.cpp b/backend/src/llvm/llvm_passes.cpp
index b8ab844..1a38a0c 100644
--- a/backend/src/llvm/llvm_passes.cpp
+++ b/backend/src/llvm/llvm_passes.cpp
@@ -181,7 +181,9 @@ namespace gbe
       case Type::VectorTyID:
       {
         const VectorType* VecTy = cast<VectorType>(Ty);
-        return VecTy->getNumElements() * getTypeBitSize(unit, VecTy->getElementType());
+        uint32_t numElem = VecTy->getNumElements();
+        if(numElem == 3) numElem = 4; // OCL spec
+        return numElem * getTypeBitSize(unit, VecTy->getElementType());
       }
       case Type::ArrayTyID:
       {
-- 
1.7.10.4