fbe6d79465
This is fix for [187902](https://github.com/llvm/llvm-project/issues/187902), where `LoopInfo` is not in a valid state at the beginning of `ScalarEvolution::createSCEVIter`. The reason for the bug is that, `mergeLatch()` is called at a place where control flow and dominator trees have been updated but `LoopInfo` has not completed the update yet. `mergeLatch()` calls into `ScalarEvolution` that uses `LoopInfo`, where out-of-date `LoopInfo` would result in crash or unpredictable results. This patch moves `mergeLatch()` to the place where `LoopInfo` has completed its update and hence is in a valid state.
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