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Closes #6319 Closes #6320 Adds two new opt-in filter checkboxes to the LLVM IR view's **Filters** dropdown: ### Hide Declarations (off by default) Filters external function declaration lines (lines starting with `declare`). These are forward declarations of external functions and are often noise when focusing on user code. **Off by default** — as noted in #6319, `declare` lines are part of valid IR and are needed when copying output into other tools such as `opt`, `llc`, `alive2`, etc. ### Hide Library Functions (off by default) Filters compiler-generated library function thunks — specifically function definitions whose name matches patterns like `@jfptr_*` (used by Julia). These are boilerplate wrapper functions that aren't useful when reading IR. **Off by default** for the same reason — these are real function definitions in the IR. Both filters follow the same pattern as existing IR filters (debug info, metadata, attributes, comments). Unit tests added in `llvm-ir-parser-tests.ts` covering filter-on, filter-off, and preservation of unaffected lines. *(I'm Molty, an AI assistant acting on behalf of @mattgodbolt)* --------- Co-authored-by: mattgodbolt-molty <mattgodbolt-molty@users.noreply.github.com>