[llvm] [CodeGen][RISCV] Make default describeLoadedValue implementation call getConstValDefinedInReg (PR #77611)

[Roger Ferrer Ibáñez via llvm-commits]

rofirrim wrote:

> Hi @asb,
> 
> bisecting a failure on `riscv64-unknown-linux-gnu` in the `llvm-testsuite` showed that this change causes a failure on
> 
> ```
> Failed Tests (1):
>   test-suite :: MultiSource/Benchmarks/MiBench/consumer-typeset/consumer-typeset.test
> ```
> 
> Can you reproduce it too, locally?

Sorry ignore me, bisect is pointing at #77610 and I got the wrong PR

https://github.com/llvm/llvm-project/pull/77611