[SIMD] wasm-ctor-eval: Fix relaxed SIMD in expressions #7508
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The previous fix #7495 handled functions computing something with
relaxed SIMD, in which case an exception is thrown, but we also need to
handle relaxed SIMD inside a function, since wasm-ctor-eval can partially-
evaluate code. In that case we get NONCONSTANT_FLOW.
Turns out adding
--kept-exportsis enough to test this, as keeping theexports around forces partial evaluation of their contents.