[llvm-dev] lld/mach-o x86_64 asserts

[Carlo Kok via llvm-dev]

On LLD mach/o x86_64 LLD calls dataInCodeTransitionStart and dataInCodeTransitionEnd, which aren't implemented (and thus return the defautl value 0), later in applyFixupFinal it reaches the default: unreachable causing miscompiles depending on the optimizer.

Attached is a simple patch that fixes this. 

It also fixes the read8 method, as object files inside .a files aren't 8 byte aligned when memory mapped.
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