Support stepping through Darwin "branch islands" (#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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