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Fixes behaviour for getFallthruLoc to handle architectures which have nop instructions.
See Pcode from a simple aarch64 binary:
Before changes, this would cause the cfg builder to assume that disassembly failed (and ultimately cause a NPE without my other PR).
Fixes for instructions with 0 length, alternatively you could choose to use #7. AFAIK, you only need one of these pull requests to fix this problem. Just close the other, up to you.