[llvm] Use thinlto and pgo for x86_64 windows release packaging (PR #71067)

[via llvm-commits]

zmodem wrote:

I used the new version of the script to package the 17.0.5 binaries, so if someone wants to try the PGO-built toolchain, it's here: https://github.com/llvm/llvm-project/releases/download/llvmorg-17.0.5/LLVM-17.0.5-win64.exe

https://github.com/llvm/llvm-project/pull/71067