message: fix build with latest LLVM
  we still need to implement all those new mem attributes..
  some tests will fail until then
diff: @@ -1426,14 +1426,6 @@ public:
  attrs.set(FnAttrs::NoRead);
  break;
  - case llvm::Attribute::ArgMemOnly:
  - attrs.set(FnAttrs::ArgMemOnly);
  - break;
  -
  - case llvm::Attribute::InaccessibleMemOnly:
  - attrs.set(FnAttrs::InaccessibleMemOnly);
  - break;
  -
  case llvm::Attribute::NoFree:
  attrs.set(FnAttrs::NoFree);
  break;
  