Attributes Rewrite

Convert the internal representation of the Attributes class into a pointer to an
opaque object that's uniqued by and stored in the LLVMContext object. The
Attributes class then becomes a thin wrapper around this opaque
object. Eventually, the internal representation will be expanded to include
attributes that represent code generation options, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165917 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/SimplifyLibCalls.cpp

@@ -350,7 +350,7 @@ struct StrToOpt : public LibCallOptimization {
       // It would be readonly too, except that it still may write to errno.
       Attributes::Builder B;
       B.addAttribute(Attributes::NoCapture);
-      CI->addAttribute(1, Attributes::get(B));
+      CI->addAttribute(1, Attributes::get(Callee->getContext(), B));
     }
 
     return 0;