[clang][bytecode] Explicit composite array descriptor types (#129376) When creating descriptor for array element types, we only save the original source, e.g. int[2][2][2]. So later calls to getType() of the element descriptors will also return int[2][2][2], instead of e.g. int[2][2] for the second dimension. Fix this by explicitly tracking the array types. The last attached test case used to have an lvalue offset of 32 instead of 24. We should do this for more desriptor types though and not just composite array, but I'm leaving that to a later patch.
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