Add experimental logic in GRExprEngine::EvalEagerlyAssume() to handle

expressions of the form: 'short x = (y != 10);' While we handle 'int x = (y !=
10)' lazily, the cast to another integer type currently loses the symbolic
constraint. Eager evaluation of the constraint causes the paths to bifurcate and
eagerly evaluate 'y != 10' to a constant of 1 or 0. This should address
<rdar://problem/6619921> until we have a better (more lazy approach) for
handling promotions/truncations of symbolic integer values.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65480 91177308-0d34-0410-b5e6-96231b3b80d8

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