Andrew Trick 11053dc4f1 Add salvageLoadDebugInfo to handle LoadInst ...

Before deleting a load, simply rewrite its debug info to refer to the
loaded address:

%l = load %a
debug_value %l, loc0, scope0, var0

--->

debug_value %a, loc0, scope0, var0, expr op_deref
%l = load %a

Note that alloc_stack addresses do not require the addition of
op_deref because they are already special-cased in IRGen.

This will be called from salvageDebugInfo when it is supported by
optmizations. Until then, it is only called selectively at -Onone.

2023-05-16 09:54:25 -07:00

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