tree 20ce0beae7663fe8ca0a07132ecd55c7c2626d41
parent 7d029af44c45c56b3b7a271c54434c2dcec1e219
author Nicolas Geoffray <ngeoffray@google.com> 1410952124 +0100
committer Nicolas Geoffray <ngeoffray@google.com> 1410952124 +0100

Ensure the first predecessor of a loop is the pre header.

Note that the check in ssa_phi_elimination.cc was very defensive:
it does not affect the outcome of the algorithm whether the
loop phi takes itself as the first input.

It makes things consistent to always have the pre header as first
input.

Change-Id: Ic86248c1f38af67f7432782f6deefae1f4bf1ab6