Dead Store Eliminator — Out-of-Tree Pass Plugin

Problem/Feature Description

A compiler research team at a university is building a custom static analysis toolkit on top of LLVM 22. They want to ship a standalone opt plugin that identifies and reports dead stores (stores to memory locations whose values are never subsequently loaded). Rather than patching LLVM itself, they want a loadable pass plugin distributed as a shared library that anyone with LLVM 22 installed can drop in and run with opt --load-pass-plugin.

The team has been burned before by out-of-tree projects that used the old LLVM pass infrastructure and broke every LLVM release. They want this new plugin built correctly from the start using the current pass infrastructure — structured so opt can find and register it, and with a lit test that validates basic behavior.

Output Specification

Produce the following files that together form the complete pass plugin project:

• CMakeLists.txt — root CMake file for the project
• DeadStoreReporter.h — pass class declaration
• DeadStoreReporter.cpp — pass implementation (the pass should at minimum iterate over a function's instructions and report stores; the exact analysis logic is up to you)
• test/dead-store-reporter.ll — a lit test file for the plugin using FileCheck

The pass should be named dead-store-reporter in the opt pipeline (i.e., usable via -passes=dead-store-reporter).

Keep the implementation focused — the grader will check the structure and API choices, not the sophistication of the analysis.