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Merging r354128 and r354131:

Authored by hansw on Feb 18 2019, 1:56 AM.

Description

Merging r354128 and r354131:


r354128 | courbet | 2019-02-15 13:58:06 +0100 (Fri, 15 Feb 2019) | 1 line

[MergeICmps][NFC] Improve doc.


r354131 | courbet | 2019-02-15 15:17:17 +0100 (Fri, 15 Feb 2019) | 15 lines

[MergeICmps] Make base ordering really deterministic.

Summary:
The idea is that we now manipulate bases through a unsigned BaseID based on
order of appearance in the comparison chain rather than through the Value*.

Fixes 40714.

Reviewers: gchatelet

Subscribers: mgrang, jfb, jdoerfert, llvm-commits, hans

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58274

llvm-svn: 354249