Make SpillIs an optional pointer. Avoid creating a bunch of temporary SmallVectors.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127388 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 4cd1604..4f1b811 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -1253,8 +1253,7 @@
 
   // Finally spill VirtReg itself.
   NamedRegionTimer T("Spiller", TimerGroupName, TimePassesIsEnabled);
-  SmallVector<LiveInterval*, 1> pendingSpills;
-  spiller().spill(&VirtReg, NewVRegs, pendingSpills);
+  spiller().spill(&VirtReg, NewVRegs, 0);
 
   // The live virtual register requesting allocation was spilled, so tell
   // the caller not to allocate anything during this round.