[gold] Enable function-sections by default.

This is needed, among others, to respect --section-ordering-file
with LTO. I'll follow up with a similar change for data sections.

I hope every version of gold available on the bots has support for
--section-ordering file.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309056 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed