[Issue 10442] RTInfo generation can fail for structs defined in imported modules

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=10442

--- Comment #6 from Rainer Schuetze <r.sagitario at gmx.de> ---
The definition of RTInfo(T) in object.d has changed since 2013 from 0x12345678
to null.

The test in https://github.com/dlang/dmd/pull/2480 verifies that
https://github.com/dlang/dmd/blob/master/src/dmd/todt.d#L1394 doesn't use the
fallback if no RTInfo has been evaluated (which writes 1 if the struct contains
pointers).

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