Avoid potentially derefencing a null pointer in a call to memcpy. (#2304)
Avoid potentially derefencing a null pointer in a call to memcpy. (#2304)

GCC 7 objects to a memcpy in create_and_initialize_module_data().

(It seems that C99 requires the pointers dest and src to be valid in
memcpy(dest, src, n) even if n is zero.)

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