According to ECMA-262 §15.4.5 (MethodDefinitionEvaluation),
getters and setters defined in class bodies
must create property descriptors with
[[Enumerable]]: false. Previously we incorrectly marked them enumerable.
This patch updates `ClassMethod::class_element_evaluation` so that both
getter and setter descriptors use `.enumerable = false`.
This prevents the variables declared inside a class static initializer
to escape to the nearest containing function causing all sorts of memory
corruptions.
The new test case crashes during bytecode generation due to
`emit_super_reference` not correctly generating the reference record
for the property access.
