- Check if a register is livein before removing it. It may have already been removed.

- Do not iterate over SmallPtrSet, the order of iteration is not deterministic.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50209 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/MachineBasicBlock.h

@@ -176,6 +176,10 @@ public:
   ///
   void removeLiveIn(unsigned Reg);
 
+  /// isLiveIn - Return true if the specified register is in the live in set.
+  ///
+  bool isLiveIn(unsigned Reg) const;
+
   // Iteration support for live in sets.  These sets are kept in sorted
   // order by their register number.
   typedef std::vector<unsigned>::iterator       livein_iterator;