[compiler-rt] [compiler-rt] adding preadv2/pwritev2 interceptions. (PR #97216)

[Daniel Thornburgh via llvm-commits]

mysterymath wrote:

This broke the Fuchsia toolchain build:
https://luci-milo.appspot.com/ui/p/fuchsia/builders/toolchain.ci/clang-linux-x64/b8742307122405229761/overview

Reverted, but let me know if the fix doesn't end up being obvious.

https://github.com/llvm/llvm-project/pull/97216