[llvm] r216905 - Replace -use-init-array with -use-ctors.

[Tim Northover]

> Given the small gains, I don't really see a point in going to all the
> associated pain...

It's llc, an internal tool. All associated pain is here (and seems to
consist of 4 tests), and if opinions are being totted up I'm all in
favour of a .init_array default. On the Clang side it's what most
people will expect for new systems, and having LLVM differ is just
weird.

Cheers.

Tim.