tree aa13e2795a2b9e1469a941af4856ae1751cf48db
parent bbcec62c0484fbfb82ee2c317e8afa478a63027b
author Nicolas Geoffray <ngeoffray@google.com> 1434727025 +0100
committer Nicolas Geoffray <ngeoffray@google.com> 1434973136 +0100

Be careful with predecessor/successor index.

When we simplify the CFG, we must preserve things that were already
simplified. For example, the index in the predecessor list or
successor list of a block must be preserved for ensuring the
first block is a loop pre header.

bug:21867463

(cherry picked from commit 8b20f88b0a8d1b374dd5eaae289d19734c77b8f8)

Change-Id: I2581b5a50942290da96cd9ec876f6f2573e0a6c4