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Revision tags: llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3
# 0e5c504d 26-Mar-2024 Emil Pedersen <3mille.prenom.nom@gmail.com>

[DebugInfo] [SelectionDAG] Fix handling of duplicate dbg values (#86598)

Before this fix, a duplicate llvm.dbg.value intrinsic referring to an
argument, after an alloca, would be generated with `$n

[DebugInfo] [SelectionDAG] Fix handling of duplicate dbg values (#86598)

Before this fix, a duplicate llvm.dbg.value intrinsic referring to an
argument, after an alloca, would be generated with `$noreg`, losing
debug information. Instead, we silently drop the second debug info, so
it doesn't break the first one.

rdar://125375717

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