[PATCH] Fix for bug in indvars/ SCEV generating infinite loop (pr18886)

[Andrew Trick]

I added a test case to ScalarEvolution/max-trip-count.ll to directly test -scalar-evolution -analyze.
You could similarly adapt your test case and add it to the same file.

+; CHECK: Loop %for.body.i: <multiple exits> Unpredictable backedge-taken count. 
+; CHECK: Loop %for.body.i: max backedge-taken count is 1

http://reviews.llvm.org/D3837