Dead code cleanup #826

Job	Run time
iOS (aarch64-apple-ios, iphoneos)	41s
Test (ubuntu-20.04, stable)	1m 53s
iOS (x86_64-apple-ios, iphonesimulator)	24s
Docker (aarch64-unknown-linux-gnu)	58s
Test (ubuntu-20.04, beta)	19s
Docker (arm-unknown-linux-gnueabihf)	36s
Test (ubuntu-20.04, nightly)	18s
Docker (armv7-unknown-linux-gnueabihf)	30s
Build Targets (wasm32-unknown-unknown)	15s
Test (macos-latest, stable)	35s
Docker (i586-unknown-linux-gnu)	27s
Build Targets (wasm32-wasi)	14s
Test (macos-latest, nightly)	38s
Docker (i686-unknown-linux-gnu)	41s
Build Targets (x86_64-unknown-fuchsia)	18s
Test (windows-latest, stable-x86_64-msvc)	2m 15s
Docker (powerpc64-unknown-linux-gnu)	54s
Build Targets (x86_64-fortanix-unknown-sgx)	17s
Test (windows-latest, stable-i686-msvc)	35s
Docker (s390x-unknown-linux-gnu)	44s
Build Targets (x86_64-unknown-illumos)	16s
Test (windows-latest, stable-x86_64-gnu)	38s
Docker (x86_64-pc-windows-gnu)	46s
Docker (x86_64-unknown-linux-gnu)	33s
Miri	2m 32s
Docker (x86_64-unknown-linux-musl)	28s
MSRV	2m 13s
Docker (arm-linux-androideabi)	1m 32s
Docker (armv7-linux-androideabi)	1m 6s
Rustfmt	8s
Docker (aarch64-linux-android)	1m 40s
Windows AArch64	1m 29s
Docker (i686-linux-android)	1m 24s
Docker (x86_64-linux-android)	1m 16s
	29m 33s

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