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b7840ddf08
Bit-Tracking Dead Code Elimination (bdce) do not mark dbg.value as undef after deleting instruction. which shows invalid state of variable in debugger. This patches fixes this by marking the dbg.value as undef which depends on dead instruction. This fixes https://bugs.llvm.org/show_bug.cgi?id=41925 Patch by kamlesh kumar! Differential Revision: https://reviews.llvm.org/D70040