Minimize casts to pointers #1849

Job	Run time
Format	30s
Check docs	32s
Clippy	1m 18s
Run Hermit for Rust (x86_64 + kvm)	3m 59s
Run (x86_64, rusty_demo, none, dev)	6m 41s
Build	1m 36s
Run (x86_64, rusty_demo, none, release)	5m 35s
Test	1m 50s
Run (x86_64, httpd, virtio-net-pci, dev)	3m 16s
Run (x86_64, httpd, virtio-net-pci, release)	4m 34s
Check	1m 4s
Run (x86_64, httpd, rtl8139, dev)	3m 13s
Run (x86_64, httpd, rtl8139, release)	3m 59s
Run (x86_64, testudp, virtio-net-pci, dev)	3m 11s
Run (x86_64, testudp, virtio-net-pci, release)	3m 22s
Run (x86_64, testudp, rtl8139, dev)	4m 4s
Run (x86_64, testudp, rtl8139, release)	3m 54s
Run (x86_64, hello_world, none, dev)	3m 3s
Run (x86_64, hello_world, none, release)	3m 40s
Run (aarch64, rusty_demo, none, dev)	5m 21s
Run (aarch64, rusty_demo, none, release)	4m 36s
Run (aarch64, httpd, virtio-net-pci, dev)	3m 42s
Run (aarch64, httpd, virtio-net-pci, release)	3m 27s
Run (aarch64, testudp, virtio-net-pci, dev)	3m 35s
Run (aarch64, testudp, virtio-net-pci, release)	4m 13s
	1h 24m 15s

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