https://github.com/jimingham created 
https://github.com/llvm/llvm-project/pull/139301

When an intra-module jump doesn't fit in the immediate branch slot, the Darwin 
linker inserts "branch island" symbols, and emits code to jump from branch 
island to branch island till it makes it to the actual function.

The previous submissions failed because in that environment the linker was 
putting the `foo.island` symbol at the same address as the `padding` symbol we 
we emitting to make our faked-up large binary.  This submission jams a byte 
after the padding symbol so that the other symbols can't overlap it.

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