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[flang] add attribute to trim runtime implementation establish call

Authored by jeanPerier on Feb 24 2021, 9:53 AM.

Description

[flang] add attribute to trim runtime implementation establish call

CFI allocatable attribute is needed so that the descriptor for the
result can be allocated/deallocated.

Reviewed By: klausler

Differential Revision: https://reviews.llvm.org/D97395

Details