[lld] [LLD][ELF] Do not reuse thunks in OVERLAYs (PR #200415)

[Peter Smith via llvm-commits]

smithp35 wrote:

> I'll give it a try later today. Thanks for the PR!
> 
> > I didn't get any OOM notifications from the 32-bit Arm buildbots, although these will be 32-bit containers running on a 64-bit kernel so will get 4 GiB of memory, and likely have access to swap too.
> 
> Our builders in Alpine Linux are also 32-bit containers on 64-bit hosts, but I saw this on both armv6, armv7 and x86 (32-bit) there. Interesting that it doesn't fail for you.

I was about to point to [clang-armv8-lld-2stage](https://lab.llvm.org/buildbot/#/builders/122) but it appears to have been turned off a couple of Months ago. Looks like there aren't any 32-bit builders that include lld.

https://github.com/llvm/llvm-project/pull/200415