[clang] [CIR] Fix InlineAsmOp roundtrip parse crash on cir.asm (PR #186588)

[Henrich Lauko via cfe-commits]

xlauko wrote:

### Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

🤖 Generated with [Claude Code](https://claude.ai/code)

<sub>- If this code review was useful, please react with 👍. Otherwise, react with 👎.</sub>

https://github.com/llvm/llvm-project/pull/186588