1b84acb23a
The current loop or any of its sub-loops may be infinite. Unless the function or the loops are marked as mustprogress, this in itself makes the loop *not* dead. This patch moves the logic to check whether the current loop is finite or mustprogress to `isLoopDead` and also extends it to check the sub-loops. This should fix PR50511. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D103382