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[VFS] Unify iteration code for VFSFromYamlDirIterImpl, NFC intended.

Authored by vsapsai on Aug 7 2018, 4:00 PM.

Description

[VFS] Unify iteration code for VFSFromYamlDirIterImpl, NFC intended.

First and subsequent iteration steps are similar, capture this similarity.

Reviewers: bruno, benlangmuir

Reviewed By: bruno

Subscribers: dexonsmith, cfe-commits

Differential Revision: https://reviews.llvm.org/D50118

llvm-svn: 339199