[PATCH] D20379: Codegen: Fix broken assumption in Tail Merge.

[Kyle Butt via llvm-commits]

iteratee added a comment.

There's now a test for the codepath that handles empty blocks with no successors. I tested, and that seems to be the driver behind all the other test changes as well.

The two other code changes at 969 and 1270 were from looking over the file to see if there were other places where fallthrough was being assumed instead of actually tested.
I can split those out into a separate patch if you would prefer.


http://reviews.llvm.org/D20379