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[flang] Correct handling of null pointer initializers

Authored by klausler on Nov 17 2020, 1:15 PM.

Description

[flang] Correct handling of null pointer initializers

Fortran defines "null-init" null pointer initializers as
being function references, syntactically, that have to resolve
to calls to the intrinsic function NULL() with no actual
arguments.

Differential revision: https://reviews.llvm.org/D91657

Details