Minimize casts to pointers #1885

Job	Run time
Build	2m 37s
Check	1m 1s
Check docs	30s
Clippy	1m 28s
Test	1m 12s
Run (x86_64, rusty_demo, none, dev)	3m 39s
Format	26s
Run (x86_64, rusty_demo, none, release)	3m 52s
Run Hermit for Rust (x86_64 + kvm)	3m 51s
Run (x86_64, httpd, virtio-net-pci, dev)	3m 2s
Run (x86_64, httpd, virtio-net-pci, release)	2m 40s
Run (x86_64, httpd, rtl8139, dev)	2m 29s
Run (x86_64, httpd, rtl8139, release)	3m 35s
Run (x86_64, testudp, virtio-net-pci, dev)	3m 35s
Run (x86_64, testudp, virtio-net-pci, release)	2m 48s
Run (x86_64, testudp, rtl8139, dev)	2m 28s
Run (x86_64, testudp, rtl8139, release)	2m 47s
Run (x86_64, hello_world, none, dev)	2m 30s
Run (x86_64, hello_world, none, release)	3m 25s
Run (aarch64, rusty_demo, none, dev)	3m 26s
Run (aarch64, rusty_demo, none, release)	3m 22s
Run (aarch64, httpd, virtio-net-pci, dev)	3m 54s
Run (aarch64, httpd, virtio-net-pci, release)	3m 1s
Run (aarch64, testudp, virtio-net-pci, dev)	2m 28s
Run (aarch64, testudp, virtio-net-pci, release)	3m 37s
	1h 7m 43s

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