[llvm] [RISCV] Rematerialize load (PR #73924)

[Niwin Anto via llvm-commits]

niwinanto wrote:

> Have you tested the relevant benchmarks, such as specs？？？

There was a slight improvement to CoreMark(Ported for our experimental RISCV target). I have not tried spec, I do not have access to it. But I can try other benchmarks https://llvm.org/docs/TestSuiteGuide.html

https://github.com/llvm/llvm-project/pull/73924