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[modules] Print input files when -module-file-info file switch is passed.

Authored by v.g.vassilev on Jul 17 2018, 11:49 PM.

Description

[modules] Print input files when -module-file-info file switch is passed.

This patch improves traceability of duplicated header files which end
up in multiple pcms.

Differential Revision: https://reviews.llvm.org/D47118

llvm-svn: 337353

Details