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Add a module Hash in the bitcode and the combined index, implementing a kind of…

Authored by mehdi_amini on Mar 31 2016, 10:33 PM.

Description

Add a module Hash in the bitcode and the combined index, implementing a kind of "build-id"

This is intended to be used for ThinLTO incremental build.

Differential Revision: http://reviews.llvm.org/D18213

This is a recommit of r265095 after fixing the Windows issues.

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 265111