Fix CUDA build with clang++. (#1273) #1999

Job	Run time
Clippy	12s
Test wasm (wasm32-unknown-unknown)	15s
Test build-std (aarch64-tvos)	1m 55s
Test CUDA support	39s
Test build-std (aarch64-tvos-sim)	1m 54s
MSRV (ubuntu-latest)	21s
Test build-std (x86_64-tvos)	1m 58s
Rustfmt	6s
MSRV (windows-latest)	44s
semver-checks	2m 26s
MSRV (macos-latest)	28s
Test wasm32-wasip1-thread	28s
Test (stable)	1m 42s
Test (beta)	1m 27s
Test (nightly)	1m 13s
Test (linux32)	2m 10s
Test (macos)	3m 50s
Test (aarch64-macos)	1m 33s
Test (aarch64-ios)	1m 7s
Test (win32)	3m 0s
Test (win64)	4m 13s
Test (mingw32)	3m 17s
Test (mingw64)	3m 23s
Test (windows-2019)	4m 27s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	2m 50s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	5m 48s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	7m 12s
	58m 38s

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