Fix value label ranges resolution (#1572)

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

crates/debug/src/transform/unit.rs

@@ -386,7 +386,7 @@ where
         }
 
         if let Some(AttributeValue::Exprloc(expr)) = entry.attr_value(gimli::DW_AT_frame_base)? {
-            if let Some(expr) = compile_expression(&expr, unit.encoding(), None, isa)? {
+            if let Some(expr) = compile_expression(&expr, unit.encoding(), None)? {
                 current_frame_base.push(new_stack_len, expr);
             }
         }
@@ -432,7 +432,11 @@ where
             out_strings,
             &mut pending_die_refs,
             &mut pending_di_refs,
-            FileAttributeContext::Children(&file_map, file_index_base, current_frame_base.top()),
+            FileAttributeContext::Children {
+                file_map: &file_map,
+                file_index_base,
+                frame_base: current_frame_base.top(),
+            },
             isa,
         )?;