[clang] [clang] Enable -fstack-clash-protection by default for Android (PR #209279)

[Aaron Ballman via cfe-commits]

AaronBallman wrote:

CC @rnk because of the concerns raised around our existing AI policy (I know Reid is working on updates, so not expecting you to review anything here, just for awareness).

> It matters because the PR description becomes the commit message.

FWIW, I agree that the PR summary doesn't really match our developer policy on [commit messages](https://llvm.org/docs/DeveloperPolicy.html#commit-messages). In particular:

> The body should be concise, but explanatory, including a complete rationale. Unless it is required to understand the change, examples, code snippets and gory details should be left to bug comments, web review or the mailing list.

Also:

> On nurturing new contributors — I don't disagree in principle, but the base rate has changed.

I share this frustration and the concerns about the burdens our AI policies put on maintainers in particular. However, I think @nickdesaulniers was correct to push back on the original tone. Our [Code of Conduct](https://llvm.org/docs/CodeOfConduct.html) pushes us towards being careful in the words we choose, so that's worth keeping in mind for next time. Thank you for correcting that with more clarification; it's good that you raised your frustrations in a more productive way because public statements help folks like Reid when working on policies.

https://github.com/llvm/llvm-project/pull/209279