simplify by using CallSite constructors; virtually eliminates CallSite::get from the tree

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109687 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/DeadArgumentElimination.cpp b/lib/Transforms/IPO/DeadArgumentElimination.cpp
index c06d688..7202f50 100644
--- a/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -220,11 +220,11 @@
   //
   std::vector<Value*> Args;
   while (!Fn.use_empty()) {
-    CallSite CS = CallSite::get(Fn.use_back());
+    CallSite CS(Fn.use_back());
     Instruction *Call = CS.getInstruction();
 
     // Pass all the same arguments.
-    Args.assign(CS.arg_begin(), CS.arg_begin()+NumArgs);
+    Args.assign(CS.arg_begin(), CS.arg_begin() + NumArgs);
 
     // Drop any attributes that were on the vararg arguments.
     AttrListPtr PAL = CS.getAttributes();
@@ -724,7 +724,7 @@
   //
   std::vector<Value*> Args;
   while (!F->use_empty()) {
-    CallSite CS = CallSite::get(F->use_back());
+    CallSite CS(F->use_back());
     Instruction *Call = CS.getInstruction();
 
     AttributesVec.clear();