Unbreak build with gcc 4.3: provide missed includes and silence most annoying warnings.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47367 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/IPO/SimplifyLibCalls.cpp

@@ -30,6 +30,7 @@
 #include "llvm/Support/Debug.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Transforms/IPO.h"
+#include <cstring>
 using namespace llvm;
 
 /// This statistic keeps track of the total number of library calls that have