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Optimize try_eval_bits to avoid layout queries
This specifically targets match checking, but is possibly more widely useful as well. In code with large, single-value match statements, we were previously spending a lot of time running layout_of for the primitive types (integers, chars) -- which is essentially useless. This optimizes the code to avoid those query calls by directly obtaining the size for these types, when possible. It may be worth considering adding a `size_of` query in the future which might be far faster, especially if specialized for "const" cases -- match arms being the most obvious example. It's possibly such a function would benefit from *not* being a query as well, since it's trivially evaluatable from the sty for many cases whereas a query needs to hash the input and such.
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