message: llvm2alive: fix crash with byval over vscale
diff: @@ -1097,8 +1097,8 @@ public:
  case llvm::Attribute::ByVal: {
  attrs.set(ParamAttrs::ByVal);
  auto ty = aset.getByValType();
  - unsigned asz = DL().getTypeAllocSize(ty);
  - attrs.blockSize = max(attrs.blockSize, asz);
  + auto asz = DL().getTypeAllocSize(ty);
  + attrs.blockSize = max(attrs.blockSize, (unsigned)asz.getKnownMinSize());
  attrs.set(ParamAttrs::Align);
  attrs.align = max(attrs.align, DL().getABITypeAlignment(ty));
  