[llvm] Extend GCC workaround to GCC < 8.4 for llvm::iterator_range ctor (PR #82643)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

> Maybe we need some more buildbots to test the versions of gcc we support

It's difficult to be comprehensive: for example I have a bot for gcc 7.5, but this kind of fix made it to gcc 8.4 and was back ported to gcc 7.4.
So we won't catch problems with gcc-8.0,  gcc-8.1,  gcc-8.2, ... unless we test them all. 
Do you see a principled solution here?

https://github.com/llvm/llvm-project/pull/82643