Add `try` intrinsics #8297

Job	Run time
build-and-check-ubuntu-32bit	25m 14s
build-and-check-ubuntu-64bit-glibcxx	26m 5s
build-and-check-asan	30m 7s
build-and-check-gcc-5	31m 50s
build-and-check-clang-macos	42m 35s
build-and-check-ubuntu-64bit	25m 22s
	3h 1m 13s

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