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Do not construct std::string from nullptr

Authored by georgthegreat on Nov 5 2020, 12:10 PM.

Description

Do not construct std::string from nullptr

While I am trying to forbid such usages systematically in https://reviews.llvm.org/D79427 / P2166R0 to C++ standard, this PR fixes this (definitelly incorrect) usage in llvm.

This code is unreachable, so it could not cause any harm

Reviewed By: nikic, dblaikie

Differential Revision: https://reviews.llvm.org/D87697

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