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This doesn't cause us to construct dominator trees any more often in the normal pipeline, and removes an entire mode of memdep that needed to be reasoned about and maintained. Perhaps more importantly, it removes the ability for the results of memdep to be different because of accidental pass scheduling goofs or the order of evaluation of 'getResult' calls. Essentially, 'getCachedResult', unless across IR-unit boundaries, is extremely dangerous. We need to work much harder to avoid it (or its analog in the old pass manager). llvm-svn: 263232
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