[clang] [clang][Driver] Forward --no-demangle in BareMetal toolchain (PR #215087)

[Yuwei Zhao via cfe-commits]

fyrsta7 wrote:

I have read the linked LLVM policies, reviewed and understand all code and text in this PR, and disclosed the AI assistance in the PR description.

https://github.com/llvm/llvm-project/pull/215087