[clang] [llvm] [clang-cl] Use MSVC's "GS buffer" heuristic for the default /GS (PR #225626)

[Pan Tao via cfe-commits]

PanTao2 wrote:

@efriedma-quic Thank you very much for your comment and sharing of the related PR. Could you please check if the new version meets your expectations?

https://github.com/llvm/llvm-project/pull/225626