Make TypedArray::update externally safe by adding unsafe block #832

Job	Run time
android	5m 33s
linux (--features debugmozjs)	5m 31s
linux (aarch64-unknown-linux-gnu)	8m 51s
linux	4m 49s
integrity	25s
mac (--features debugmozjs)	9m 32s
linux (armv7-unknown-linux-gnueabihf)	8m 27s
mac	9m 44s
windows (--features debugmozjs, x86_64-pc-windows-msvc)	10m 53s
windows (--features debugmozjs, aarch64-pc-windows-msvc)	9m 19s
windows (x86_64-pc-windows-msvc)	11m 12s
windows (aarch64-pc-windows-msvc)	9m 12s
Result	1s
	1h 33m 29s

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