Use SmallVectorImpl instead of SmallVector as method argument to avoid specifying vector size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185513 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CriticalAntiDepBreaker.cpp b/lib/CodeGen/CriticalAntiDepBreaker.cpp
index 7a7d435..18c8e0a 100644
--- a/lib/CodeGen/CriticalAntiDepBreaker.cpp
+++ b/lib/CodeGen/CriticalAntiDepBreaker.cpp
@@ -361,7 +361,7 @@
                          unsigned AntiDepReg,
                          unsigned LastNewReg,
                          const TargetRegisterClass *RC,
-                         SmallVector<unsigned, 2> &Forbid)
+                         SmallVectorImpl<unsigned> &Forbid)
 {
   ArrayRef<MCPhysReg> Order = RegClassInfo.getOrder(RC);
   for (unsigned i = 0; i != Order.size(); ++i) {