changes to make it compatible with 64bit gcc

llvm-svn: 2792
diff --git a/llvm/lib/Transforms/Scalar/GCSE.cpp b/llvm/lib/Transforms/Scalar/GCSE.cpp
index 850e65a..56bb191 100644
--- a/llvm/lib/Transforms/Scalar/GCSE.cpp
+++ b/llvm/lib/Transforms/Scalar/GCSE.cpp
@@ -23,6 +23,9 @@
 #include "llvm/Support/CFG.h"
 #include "Support/StatisticReporter.h"
 #include <algorithm>
+using std::set;
+using std::map;
+
 
 static Statistic<> NumInstRemoved("gcse\t\t- Number of instructions removed");
 static Statistic<> NumLoadRemoved("gcse\t\t- Number of loads removed");