changes to make it compatible with 64bit gcc

llvm-svn: 2791
diff --git a/llvm/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp b/llvm/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
index c7c9756..e884463 100644
--- a/llvm/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
+++ b/llvm/lib/CodeGen/RegAlloc/PhyRegAlloc.cpp
@@ -28,6 +28,7 @@
 #include <iostream>
 #include <math.h>
 using std::cerr;
+using std::vector;
 
 RegAllocDebugLevel_t DEBUG_RA;
 static cl::Enum<RegAllocDebugLevel_t> DEBUG_RA_c(DEBUG_RA, "dregalloc",