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

llvm-svn: 216158
diff --git a/llvm/lib/CodeGen/SjLjEHPrepare.cpp b/llvm/lib/CodeGen/SjLjEHPrepare.cpp
index d14e29b..3a6c648 100644
--- a/llvm/lib/CodeGen/SjLjEHPrepare.cpp
+++ b/llvm/lib/CodeGen/SjLjEHPrepare.cpp
@@ -139,7 +139,7 @@
 /// MarkBlocksLiveIn - Insert BB and all of its predescessors into LiveBBs until
 /// we reach blocks we've already seen.
 static void MarkBlocksLiveIn(BasicBlock *BB,
-                             SmallPtrSet<BasicBlock *, 64> &LiveBBs) {
+                             SmallPtrSetImpl<BasicBlock *> &LiveBBs) {
   if (!LiveBBs.insert(BB))
     return; // already been here.