Debugger: More memory management fixes.
DwarfImageDebugInfo:
- Type name/info entries weren't being freed properly.
BaseUnit:
- The array of entries itself was being destroyed, but not the actual
objects. Consequently none of the DIE objects were ever being freed.
CfaRuleSet:
- The register rules array wasn't being freed.
FileManager:
- References to entries weren't being released. Some more work remains to be
done here though, as a subset of these objects still have a non-zero ref
count in the end.