Convert SelectionDAG::ComputeMaskedBits to use APInt instead of uint64_t.
Add an overload that supports the uint64_t interface for use by clients
that haven't been updated yet.

llvm-svn: 47039
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.h b/llvm/lib/Target/PowerPC/PPCISelLowering.h
index ae42aeb..2b20e26 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.h
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.h
@@ -254,9 +254,9 @@
     virtual SDOperand PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const;
     
     virtual void computeMaskedBitsForTargetNode(const SDOperand Op,
-                                                uint64_t Mask,
-                                                uint64_t &KnownZero, 
-                                                uint64_t &KnownOne,
+                                                APInt Mask,
+                                                APInt &KnownZero, 
+                                                APInt &KnownOne,
                                                 const SelectionDAG &DAG,
                                                 unsigned Depth = 0) const;