Rust's sanitizer integration previously lacked support for the sanitize ignorelist, a centralized mechanism used by Clang to specify functions, files, or other code regions that should be excluded from sanitizer instrumentation.

Without ignorelist support, Rust's sanitizers instrumented all code indiscriminately, leading to potential false positives or unnecessary overhead when certain known safe or problematic code sections should be exempted.

This PR implemented full support for the Clang-style sanitize ignorelist in Rust's sanitizer tooling, enabling users to specify ignorelist files that control which code elements are excluded from sanitizer instrumentation, aligning Rust's behavior with Clang's sanitizer infrastructure.

Adding ignorelist support improves Rust's sanitizer usability and accuracy by allowing fine-grained control over instrumentation, reducing noise and overhead in sanitizer reports and making sanitizer integration more robust and configurable.