Merge #383

383: Reuse fold-const.c from GCC to enforce const array capacities r=philberty a=philberty

Rust allows for constant eval for cases like array capacity, the initial
version of this code forced the programmer to only use literals which was
not correct but got the type system off the ground.

This now takes advantage of the GCC backend object to offer 3 helprs.

 1. check for constant Bexpression* are equal
 2. extract a size_t constant value from the Bexpression*
 3. to string the Bexpression constant

We can get away with the extraction of the value here because we know its going to be a usize for array capacity but some thought is needed if these methods are to be reused in other cases.

There is a new ConstFold namespace which should be extensible for const
functions later on and const generics.

Fixes: #296

Co-authored-by: Philip Herron <philip.herron@embecosm.com>

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