we are supposed to only create proper CallSites from an instruction (esp. CallInst and InvokeInst)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109576 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/llvm/Support/CallSite.h b/include/llvm/Support/CallSite.h
index 56f5aa9..c2d78b1 100644
--- a/include/llvm/Support/CallSite.h
+++ b/include/llvm/Support/CallSite.h
@@ -49,8 +49,8 @@
   PointerIntPair<InstrTy*, 1, bool> I;
 public:
   CallSiteBase() : I(0, false) {}
-  CallSiteBase(CallTy *CI) : I(CI, true) { /*assert(CI);*/ }
-  CallSiteBase(InvokeTy *II) : I(II, false) { /*assert(II);*/ }
+  CallSiteBase(CallTy *CI) : I(CI, true) { assert(CI); }
+  CallSiteBase(InvokeTy *II) : I(II, false) { assert(II); }
   CallSiteBase(ValTy *II) { *this = get(II); }
   CallSiteBase(InstrTy *II) {
     assert(II && "Null instruction given?");