Move RABasic::addMBBLiveIns to the base class, it is generally useful.

Minor optimization to the use of IntervalMap iterators. They are fairly
heavyweight, so prefer SI.valid() over SI != end().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121217 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocBase.h b/lib/CodeGen/RegAllocBase.h
index 32f5e08..7f38c9b 100644
--- a/lib/CodeGen/RegAllocBase.h
+++ b/lib/CodeGen/RegAllocBase.h
@@ -149,6 +149,9 @@
   bool spillInterferences(LiveInterval &VirtReg, unsigned PhysReg,
                           SmallVectorImpl<LiveInterval*> &SplitVRegs);
 
+  /// addMBBLiveIns - Add physreg liveins to basic blocks.
+  void addMBBLiveIns(MachineFunction *);
+
 #ifndef NDEBUG
   // Verify each LiveIntervalUnion.
   void verify();