[llvm] [RISCV] AddEdge between mask producer and user of V0 (PR #146855)

[Liao Chunyu via llvm-commits]

ChunyuLiao wrote:

for 'MultiSource/Benchmarks/DOE-ProxyApps-C++/CLAMR/mesh.cpp' 
Save ‘%173:vrm2nov0 = PseudoVMERGE_VVM_M2 undef %173:vrm2nov0(tied-def 0), %116:vrm2, %173:vrm2nov0, killed $v0, -1, 5’ to def mask caused this error.

https://github.com/llvm/llvm-project/pull/146855