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[SimplifyCFG] Relax restriction for folding unconditional branches

Description

[SimplifyCFG] Relax restriction for folding unconditional branches

The commit rL308422 introduces a restriction for folding unconditional
branches. Specifically if empty block with unconditional branch leads to
header of the loop then elimination of this basic block is prohibited.
However it seems this condition is redundantly strict.
If elimination of this basic block does not introduce more back edges
then we can eliminate this block.

The patch implements this relax of restriction.

Reviewers: efriedma, mcrosier, pacxx, hsung, davidxl
Reviewed By: pacxx
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D42691

Details

Committed
skatkovFeb 4 2018, 11:56 PM
Reviewer
pacxx
Differential Revision
D42691: [SimplifyCFG] Relax restriction for folding unconditional branches
Parents
rL324207: Fix indenting.
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