[llvm] [LoongArch] Emit error messages when using emulated TLS (PR #92483)

[via llvm-commits]

wangleiat wrote:

Hi all:
How about emitting an error message like [this](https://github.com/llvm/llvm-project/pull/92483/commits/8e8ce642606d5d517622d3e1845dd85c953d8358)?

https://github.com/llvm/llvm-project/pull/92483