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Stop JS3 from silently hanging if simd is not supported #882

Job	Run time
Test Build	28s
Test Browser on macOS (safari, main)	1m 13s
Test Browser on macOS (safari, disabled)	1m 14s
Test Browser on macOS (safari, default)	1m 7s
Test Browser on Linux (chrome, main)	42s
Test Browser on Linux (chrome, disabled)	1m 5s
Test Browser on Linux (firefox, default)	1m 12s
Test Browser on Linux (chrome, default)	1m 1s
Test Browser on Linux (firefox, disabled)	1m 30s
Test Shell (spidermonkey, default)	5m 0s
Test Browser on Linux (firefox, main)	1m 6s
Test Shell (spidermonkey, disabled)	1m 53s
Test Shell (jsc, main)	42s
Test Shell (jsc, default)	2m 46s
Test Shell (v8, disabled)	1m 15s
Test Shell (jsc, disabled)	1m 30s
Test Shell (spidermonkey, main)	42s
Test Shell (v8, default)	2m 40s
Test Shell (v8, main)	41s
	27m 47s