There was a bug how value labels were resolved, which caused some DWARF expressions not be transformed, e.g. those are in the registers.
* Implements FIXME in expression.rs
* Move TargetIsa from CompiledExpression structure
* Fix expression format for GDB
* Add tests for parsing
* Proper logic in ValueLabelRangesBuilder::process_label
* Tests for ValueLabelRangesBuilder
* Refactor build_with_locals to return Iterator instead of Vec<_>
* Misc comments and magical numbers
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