JIT: Unspecialize handle types after arithmetic ops in VN #70452
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VN was retaining the precise handle types when applying arithmetic
operations to handles. This meant that we could not rely on handles of
types like GTF_ICON_METHOD_HDL actually containing an embedded method
handle after constant propagation.
This change generalizes the handle type to GTF_ICON_CONST_PTR or
GTF_ICON_GLOBAL_PTR whenever VN does anything that semantically
"unassociates" the icon from the specialized handle type.