[Beignet] [PATCH] GBE: fix an potential assertion in constant expanding pass.

[Zhigang Gong]

Using the inserPos is good enough. If using --insertPos, there
is one potential issue when the insertPos is the head of a list
then it will trigger an assertion.

Signed-off-by: Zhigang Gong <zhigang.gong at intel.com>
---
 backend/src/llvm/ExpandConstantExpr.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/backend/src/llvm/ExpandConstantExpr.cpp b/backend/src/llvm/ExpandConstantExpr.cpp
index 2da765e..5c5934a 100644
--- a/backend/src/llvm/ExpandConstantExpr.cpp
+++ b/backend/src/llvm/ExpandConstantExpr.cpp
@@ -120,7 +120,7 @@ static Value *expandConstantVector(Instruction *InsertPt, ConstantVector *CV) {
   Type *IntTy = IntegerType::get(CV->getContext(), 32);
 
   BasicBlock::iterator InsertPos(InsertPt);
-  IRBuilder<> IRB(--InsertPos);
+  IRBuilder<> IRB(InsertPos);
   Value *vec = UndefValue::get(CV->getType());
   for (int i = 0; i < elemNum; i++) {
     Value *idx = ConstantInt::get(IntTy, i);
-- 
1.9.1