Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.

llvm-svn: 216158
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 948fddc..4c0345d 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -2297,7 +2297,7 @@
 /// Add the ultimately found memory instructions to MemoryUses.
 static bool FindAllMemoryUses(Instruction *I,
                 SmallVectorImpl<std::pair<Instruction*,unsigned> > &MemoryUses,
-                              SmallPtrSet<Instruction*, 16> &ConsideredInsts,
+                              SmallPtrSetImpl<Instruction*> &ConsideredInsts,
                               const TargetLowering &TLI) {
   // If we already considered this instruction, we're done.
   if (!ConsideredInsts.insert(I))