[GIsel][CombinerHelper] Fix for missed...

[GIsel][CombinerHelper] Fix for missed ElideBrByInvertingCond/CombineIndexedLoadStore combines [4/14]

Summary:
Fix an issue which could result in ElideBrByInvertingCond or
CombineIndexedLoadStore being missed when debug info is present. In both
cases the fix is s/hasOneUse/hasOneNonDbgUse/.

Reviewers: aemerson, dsanders

Subscribers: hiraditya, aprantl, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D78254