[llvm] [RISCV] Enable TTI::shouldDropLSRSolutionIfLessProfitable by default (PR #89927)

[Craig Topper via llvm-commits]

topperc wrote:

We've been using -lsr-drop-solution for some benchmarks in our downstream for a while. Overall, I think it has been a net improvement.

https://github.com/llvm/llvm-project/pull/89927