build: allow LTO with Clang 3.9.1+

Bug: #38568
Test: manual,
      - arm64-apple-darwin20.5.0 / Apple clang version 12.0.5 (clang-1205.0.22.9)
      - x86_64-pc-linux-gnu / Ubuntu clang version 13.0.0-++20210520052624+48780527dd68-1~exp1~20210520153429.417
Signed-off-by: Jesse Chan <jc@linux.com>

PR-URL: https://github.com/nodejs/node/pull/38751


Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>