[ObjC] Use the appropriate integer size for entries in __objc_ivar #7083
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The `__objc_ivar` section contains [values of type `long` for all architectures except arm64, where it contains `int`][1]. This fixes problems with resolving non-fragile ivar accesses to struct field accesses on arm64 and 32-bit architectures. [1]: https://github.com/llvm/llvm-project/blob/535d6917ec3308ade866f205644b740666312342/clang/lib/CodeGen/CGObjCMac.cpp#L5628-L5629
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The
__objc_ivarsection contains values of typelongfor all architectures except arm64, where it containsint.This fixes problems with resolving non-fragile ivar accesses to struct field accesses on arm64 and 32-bit architectures.