Change Details

The following test was taken by an instcombine test and was given debug info via `debugify`. Running `opt -instcombine debuginfo-trunc-and-zext.ll` results in two of the dbg.value intrinsics missing. This patch is a work in progress to fix this problem.

Zext instruction merging in instcombine can drop dbg.value intrinsics. This patch attempts to fix a case, when a `zext` gets replaced with an `and` instruction, both with vector and non-vector variables.

The following test was taken by aZext instruction merging in instcombine test and was givencan drop dbg.value debug info via `debugify`intrinsics. Running `opt -instcombine debuginfo-trunc-and-zext.ll`This patch attempts to fix a case, when results in two of the dbg.valuea `zext` gets replaced with an `and` instruction, both intrinsics missingwith vector and non-vector variables. This patch is a work in progress to fix this problem.