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[Loop Peeling] Fix the bug with IDom setting for exit loops

Authored by skatkov on Jul 15 2019, 2:13 AM.

Description

[Loop Peeling] Fix the bug with IDom setting for exit loops

It is possible that loop exit has two predecessors in a loop body.
In this case after the peeling the iDom of the exit should be a clone of
iDom of original exit but no a clone of a block coming to this exit.

Reviewers: reames, fhahn
Reviewed By: reames
Subscribers: hiraditya, zzheng, llvm-commits
Differential Revision: https://reviews.llvm.org/D64618

llvm-svn: 366050