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[CommandLine] Remove redundant initializers for StringRef members

Authored by malcolm.parsons on Nov 24 2016, 12:54 AM.

Description

[CommandLine] Remove redundant initializers for StringRef members

Summary: The default constructor for a StringRef stores an empty string.

Reviewers: beanz, zturner

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D27067

llvm-svn: 287857