Bug 22687 – GC Leak Detector is not freeing all addresses

Malloc logging is called per object basis but free logging depends on debug flags to work per object basis. It reports freeing per page basis, thus there are some non-freed addresses remaining in logger even those are freed. Since log_malloc doesn't check for double allocations on the same address as in the log_free which checks double frees; this got missed. Following line should be executed for Leak Detector even no debug flags are provided. https://github.com/dlang/druntime/blob/fb5494278058e2f44033b557b6f4202402f36f04/src/core/internal/gc/impl/conservative/gc.d#L2759

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