[llvm] [MC] Set SHF_EXCLUDE for AArch64 (and other) build attributes sections (PR #125824)

[Peter Smith via llvm-commits]

smithp35 wrote:

There may be some scope to add SHF_EXCLUDE to the AArch64 Build Attributes as it is new. I'd like to run it past the GNU team in Arm to make sure they're OK with it in GNU ld. I'd also like to check when it was introduced and if any older linkers error if they see it and don't understand it. 

I wouldn't want to add it to ARM as it is included in the output for GNU ld.

https://github.com/llvm/llvm-project/pull/125824