Fix Enum::from/tryFrom memory leak in JIT #8633
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when passing an int to a string enum. Previously, the int was coerced to
a string. The JIT skips parameter clean up when unnecessary. In this
particular case, passing int to from(int|string) normally doesn't cause
a coercion so no dtor for the $value zval is generated.
To circumvent this we avoid coersion by explicitly allowing ints and
converting them to strings ourselves. Then we can free it appropriately.
See GH-8518