Fix MSVC build.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90454 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ProfileEstimatorPass.cpp b/lib/Analysis/ProfileEstimatorPass.cpp
index 7cf1cc5..8148429 100644
--- a/lib/Analysis/ProfileEstimatorPass.cpp
+++ b/lib/Analysis/ProfileEstimatorPass.cpp
@@ -324,7 +324,7 @@
   // Since the entry block is the first one and has no predecessors, the edge
   // (0,entry) is inserted with the starting weight of 1.
   BasicBlock *entry = &F.getEntryBlock();
-  BlockInformation[&F][entry] = pow(2,32);
+  BlockInformation[&F][entry] = pow(2.0, 32.0);
   Edge edge = getEdge(0,entry);
   EdgeInformation[&F][edge] = BlockInformation[&F][entry];
   printEdgeWeight(edge);