bf6af8fbf0
The function `LI.erase` has some invariants that need to be preserved when it tries to remove a loop which is not the top-level loop. In particular, it requires loop's preheader to be strictly in loop's parent. Our current logic of deletion of dead blocks may erase the information about preheader before we handle the loop, and therefore we may hit this assertion. This patch changes the logic of loop deletion: we make them top-level loops before we actually erase them. This allows us to trigger the simple branch of `erase` logic which just detatches blocks from the loop and does not try to do some complex stuff that need this invariant. Thanks to @uabelho for reporting this! Differential Revision: https://reviews.llvm.org/D57221 Reviewed By: fedor.sergeev llvm-svn: 353813
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