[naga] Properly evaluate abs(most negative abstract int).
#7507
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Have constant evaluator use `wrapping_abs` instead of `abs` when applying `MathFunction::Abs` to AbstractInt values. WGSL says that applying `abs` to the most negative AbstractInt value must return it unchanged, which is what Rust's `i64::wrapping_abs` does.
jimblandy
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Have constant evaluator use
wrapping_absinstead ofabswhen applyingMathFunction::Absto AbstractInt values. WGSL says that applyingabsto the most negative AbstractInt value must return it unchanged, which is what Rust'si64::wrapping_absdoes.