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Error out of invalid Int/Word bit shifts

Alec Theriault requested to merge harpocrates/ghc:T16111 into master

Although the Haddock's for shiftL and shiftR do require the number of bits to be non-negative, we should still check this before calling out to primitives (which also have undefined behaviour for negative bit shifts).

If a user really wants to bypass checks that the number of bits is sensible, they already have the aptly-named unsafeShiftL/unsafeShiftR at their disposal.

See #16111 (closed).

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