[llvm] [DSE] Add predicated vector length store support for masked store elimination (PR #134175)

[Michael Berg via llvm-commits]

mcberg2021 wrote:

I updated the code to share between the two intrinsics, the segment in question is removed, my testing shows its safe not to have it.  The test was simplified too.

https://github.com/llvm/llvm-project/pull/134175