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[Attributor] Fix for a crash on RAUW when rewriting function signature

Authored by sdmitriev on May 11 2020, 8:05 AM.

Description

[Attributor] Fix for a crash on RAUW when rewriting function signature

Reviewers: jdoerfert, sstefan1, uenoku

Reviewed By: uenoku

Subscribers: hiraditya, uenoku, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D79680