Reorganize llvm-ir/performance_test Makefile

[ ] Avoid using call. Use recipes to create the resulting build assets. Use -D for selecting benchmark function.
[ ] Do not call perf from the Makefile.
[ ] Have an all rule that acts as a default.
[ ] Change instructions in README.md to avoid changing system/kernel flags and to work simply with make.

phillipstanleymarbell / Noisy-lang-compiler