Use SmallVectorImpl& instead of SmallVector to avoid repeating small vector size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186274 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/BasicAliasAnalysis.cpp b/lib/Analysis/BasicAliasAnalysis.cpp
index f20e83e..9fe1362 100644
--- a/lib/Analysis/BasicAliasAnalysis.cpp
+++ b/lib/Analysis/BasicAliasAnalysis.cpp
@@ -857,8 +857,8 @@
   return ModRefResult(AliasAnalysis::getModRefInfo(CS, Loc) & Min);
 }
 
-static bool areVarIndicesEqual(SmallVector<VariableGEPIndex, 4> &Indices1,
-                               SmallVector<VariableGEPIndex, 4> &Indices2) {
+static bool areVarIndicesEqual(SmallVectorImpl<VariableGEPIndex> &Indices1,
+                               SmallVectorImpl<VariableGEPIndex> &Indices2) {
   unsigned Size1 = Indices1.size();
   unsigned Size2 = Indices2.size();