Modern LLVM IR support and robustness fixes

[tkaitchuck]

This commit improves compatibility with modern Rust toolchains and adds safety checks for embedded projects with non-standard memory layouts (like XIP from Flash).

1. Fault-Tolerant IR Parsing: The parser now skips unrecognized lines instead of failing the entire analysis.
2. Robust Attribute Parsing: Updated the attribute parser to handle balanced parentheses (e.g., initializes((0, 8))).
3. Support for Metadata Lines: Added logic to skip lines starting with # (like #dbg_value) inside functions.
4. Safe Memory Range Indexing: Added range validation to prevent panics when symbols reside in Flash (XIP).
5. Soft Assertions: Downgraded stack size mismatches between LLVM and manual analysis to warnings.
6. Improved Wrapper Parsing: Made crate_name optional and handle Cargo-injected prefixes like noprelude:.