Workaround a GCC warning about a pointer being cast to a larger integral type. Use intptr which is designed to hold pointer values and pass it to off_t.
Workaround a GCC warning about a pointer being cast to a larger
integral type. Use intptr which is designed to hold pointer values
and pass it to off_t.

mysys/stacktrace.c:
  Add a compile time assert to ensure that off_t is large enough
  to hold the pointer value.

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