llvm: expose inline assembly properties

[cpunion]

Expose read-only accessors for LLVM inline-assembly values:

• assembly template and constraint string
• side-effect, aligned-stack, dialect, and can-throw properties
• binding test covering every exposed field

This lets consumers validate a bounded set of translator-owned inline assembly without treating arbitrary inline asm as safe. The implementation uses stable LLVM C++ InlineAsm accessors and targets the coroutine branch’s LLVM 19–22 support range.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.