Fixed #679: Better support for coroutines with `return_void`. #1008

Job	Run time
Linux Clang - Format check	33s
GCC 13 / LLVM 18 @ Ubuntu Release LLVM source tree	2m 5s
GCC 13 / LLVM 18 @ Ubuntu Release @arm64	6m 55s
GCC 13 / LLVM 18 @ Ubuntu Code Coverage & Debug @arm64	30m 43s
GCC 13 / LLVM 18 @ Ubuntu Code Coverage (libc++) @arm64	41m 8s
GCC 13 / LLVM 18 @ Ubuntu Release @amd64	1m 12s
GCC 13 / LLVM 18 @ Ubuntu Code Coverage & Debug @amd64	2m 40s
GCC 13 / LLVM 18 @ Ubuntu Code Coverage (libc++) @amd64	4m 4s
Clang 18 / LLVM 18 @ macOS Release	2m 59s
Clang 18 / LLVM 18 @ macOS Debug	45s
Clang 18 / LLVM 18 @ macOS Coverage & Debug	3m 24s
Final Deploy	0s
	1h 36m 28s

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