llvm dev - Mar 2018 - [SelectionDAG] DbgValue nodes aren't transferred

Hi,

I have a problem that dbg_value nodes are not transferred when integer DAG nodes
are promoted. For example, an i32 add node is promoted to a i64 add node by
DAGTypeLegalizer::PromoteIntegerResult and its dbg_value node is not transferred
to the new node.

t9: i32 = add nsw t5, t8 -->  t31: i64 = add t30, t7   ; the dbg_value node
is not transferred to the new i64 add node.

For expansion, DAGTypeLegalizer::SetExpandedInteger calls transferDbgValues()
but I couldn't find any place to call trasnferDbgValues() for integer type
promotion in DAGTypeLegalizer ::SetPromotedInteger and other places. I am
wondering If I miss anything or the legalization needs to call
transferDbgValues() for this case.

I found this problem because a recently added unittest,
DebugInfo/Generic/linear-dbg-value.ll fails for my project, and the x86 and
aarch64 backends don't have this problem since they don't promote i32
add nodes.

Thanks,
Sejong

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