Add `try` intrinsics #8290

Job	Run time
build-and-check-ubuntu-64bit	25m 15s
build-and-check-ubuntu-64bit-glibcxx	25m 52s
build-and-check-asan	29m 43s
build-and-check-clang-macos	59m 53s
build-and-check-gcc-5	30m 17s
build-and-check-ubuntu-32bit	24m 47s
	3h 15m 47s

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