Everywhere: Remove some bitrotted "#if 0" blocks

Kernel/KSyms.cpp

@@ -117,12 +117,6 @@ static void load_kernel_sybols_from_data(const KBuffer& buffer)
 NEVER_INLINE static void dump_backtrace_impl(FlatPtr base_pointer, bool use_ksyms)
 {
     SmapDisabler disabler;
-#if 0
-    if (!current) {
-        //hang();
-        return;
-    }
-#endif
     if (use_ksyms && !g_kernel_symbols_available) {
         Processor::halt();
         return;

Kernel/VM/InodeVMObject.cpp

@@ -98,40 +98,6 @@ void InodeVMObject::inode_contents_changed(Badge<Inode>, off_t offset, [[maybe_u
     for (auto& physical_page : m_physical_pages)
         physical_page = nullptr;
 
-#if 0
-    size_t current_offset = offset;
-    size_t remaining_bytes = size;
-    const u8* data_ptr = data;
-
-    auto to_page_index = [] (size_t offset) -> size_t {
-        return offset / PAGE_SIZE;
-    };
-
-    if (current_offset & PAGE_MASK) {
-        size_t page_index = to_page_index(current_offset);
-        size_t bytes_to_copy = min(size, PAGE_SIZE - (current_offset & PAGE_MASK));
-        if (m_physical_pages[page_index]) {
-            auto* ptr = MM.quickmap_page(*m_physical_pages[page_index]);
-            memcpy(ptr, data_ptr, bytes_to_copy);
-            MM.unquickmap_page();
-        }
-        current_offset += bytes_to_copy;
-        data += bytes_to_copy;
-        remaining_bytes -= bytes_to_copy;
-    }
-
-    for (size_t page_index = to_page_index(current_offset); page_index < m_physical_pages.size(); ++page_index) {
-        size_t bytes_to_copy = PAGE_SIZE - (current_offset & PAGE_MASK);
-        if (m_physical_pages[page_index]) {
-            auto* ptr = MM.quickmap_page(*m_physical_pages[page_index]);
-            memcpy(ptr, data_ptr, bytes_to_copy);
-            MM.unquickmap_page();
-        }
-        current_offset += bytes_to_copy;
-        data += bytes_to_copy;
-    }
-#endif
-
     // FIXME: Consolidate with inode_size_changed() so we only do a single walk.
     for_each_region([](auto& region) {
         region.remap();

Userland/Libraries/LibGUI/TreeView.cpp

@@ -418,19 +418,7 @@ void TreeView::did_update_selection()
     auto index = selection().first();
     if (!index.is_valid())
         return;
-#if 0
-    bool opened_any = false;
-    for (auto current = index; current.is_valid(); current = current.parent()) {
-        auto& metadata_for_ancestor = ensure_metadata_for_index(current);
-        if (!metadata_for_ancestor.open) {
-            metadata_for_ancestor.open = true;
-            opened_any = true;
-        }
-    }
-    if (opened_any)
-        update_content_size();
-    update();
-#endif
+
     if (activates_on_selection())
         activate(index);
 }