[compiler-rt] [compiler-rt][test][builtins] Check linker support for --start-group (PR #205610)

[Kelvin Li via llvm-commits]

kkwli wrote:

I push the change that suggested by @quic-garvgupt. Please take a look. If I don't hear any objection by tomorrow, I will merge it. Thanks.

https://github.com/llvm/llvm-project/pull/205610