6ba2127a5c
The [previous patch](https://github.com/llvm/llvm-project/pull/163418) has added a check to prevent adding an entry point into a constant island, but only for successfully disassembled functions. Because scanExternalRefs() is also called when a function fails to be disassembled or is skipped, it can still attempt to add an entry point at constant islands. The same issue may occur if without a check for it So, this patch complements the 'constant island' check in scanExternalRefs().
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