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[ms] llvm-lib gives a more useful error if no inputs and no output path are…

Authored by epastor on May 1 2020, 4:42 AM.

Description

[ms] llvm-lib gives a more useful error if no inputs and no output path are provided

Summary:
If no inputs and no output path are provided, llvm-lib should produce a useful error.

Before this, it would fail by reading from an unitialized StringRef.

Reviewed By: vvereschaka

Differential Revision: https://reviews.llvm.org/D79227