message: Explicitly tag constants in LLVM IR with required alignment
  (We are most likely getting lucky with this today, but this will eventually blow up.)
diff: @@ -281,6 +281,7 @@ Status IrEmitter::HandleConstant(HloInstruction* constant,
  /*Linkage=*/llvm::GlobalValue::PrivateLinkage,
  /*Initializer=*/initializer,
  /*Name=*/"");
  + global_for_const->setAlignment(MinimumAlignmentForShape(literal.shape()));
  emitted_value_[constant] = global_for_const;
  VLOG(2) << " emitted value: " << llvm_ir::DumpToString(*global_for_const);
  VLOG(2) << " its type: "
  