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When LazyValueInfo uses @llvm.assume intrinsics to provide edge-value constraints, we should check for intrinsics that dominate the edge's branch, not just any potential context instructions. An assumption that dominates the edge's branch represents a truth on that edge. This is specifically useful, for example, if multiple predecessors assume a pointer to be nonnull, allowing us to simplify a later null comparison. The test case, and an initial patch, were provided by Philip Reames. Thanks! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219688 91177308-0d34-0410-b5e6-96231b3b80d8
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