add slice cast support #1663

Job	Run time
Lint	43s
Android (ubuntu-latest, aarch64-linux-android)	4m 28s
Test (ubuntu-latest)	4m 27s
cargo-deny	1m 4s
Compiletest (windows-latest)	3m 49s
cargo-gpu-os (ubuntu-latest)	3m 51s
Test (windows-latest)	3m 50s
Compiletest (macOS-latest)	4m 32s
cargo-gpu-os (windows-latest)	3m 47s
cargo-gpu-os (macos-latest)	3m 51s
Compiletest (ubuntu-latest)	3m 49s
Difftest (windows-latest)	3m 47s
Difftest (macOS-latest)	3m 55s
Test (macOS-latest)	3m 44s
Difftest (ubuntu-latest)	3m 50s
cargo-gpu-backwards-compat (e767f24f2565baf1a71bbaf84d453d181cab2417)	2m 44s
cargo-gpu-backwards-compat (2326b87fe1542eeb898065e36ac949307b55386d, =0.30.7)	2m 44s
cargo-gpu-backwards-compat (0.9.0, 0.24.2)	2m 43s
cargo-gpu-backwards-compat (eea8998df9dc2fd8e7a65c5b5b7ae20c238a665a, 0.29.3)	2m 44s
cargo-gpu-backwards-compat (877bd8697a15f3e6d09446a5e1807e6237ca1dac)	2m 44s
cargo-gpu-backwards-compat (f79c4181a5dc2d37303947b113f190930c6c1ce6, =0.30.7)	2m 44s
cargo-gpu-backwards-compat (30896871ba00e668029ccb724f1438202b284708)	2m 44s
test_success	2s
	1h 12m 36s

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