[llvm] [RISCV] Add searchable table for tune information (PR #66193)

[Michael Maitland via llvm-commits]

michaelmaitland wrote:

We collected some data that shows that different values of these variables are better on different benchmarks. Do we have the ability to override these values at compile time so that different benchmarks can specify which alignment to use?

https://github.com/llvm/llvm-project/pull/66193