use `__is_function` intrinsic in `__invoke` implementation #1768

Job	Run time
CPU (Windows) (msvc, Debug)	7s
CPU (clang 13, Debug, ubuntu 20.04)	9s
CPU (Windows) (msvc, Release)	5s
macos-CPU (MacOS) (clang, Debug)	20s
CPU (clang 13, Release, ubuntu 20.04)	8s
macos-CPU (MacOS) (clang, Release)	20s
CPU (gcc 11, Debug, ubuntu 22.04)	9s
CPU (gcc 11, Release, ubuntu 22.04)	9s
CPU (gcc 11, Release, ubuntu 22.04, TSAN)	7s
CPU (gcc 11, Release, ubuntu 22.04, ASAN)	8s
CI (CPU)	1s
CI (CPU) (Windows)	1s
CI (CPU) (MacOS)	1s
	1m 45s

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