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Avoid computing InvisibleToCallerBefore/AfterRet up front. In most cases, this information is not really needed. Instead, introduce helper functions to compute and cache the result on demand. Notably, this also does not use PointerMayBeCapturedBefore for isInvisibleToCallerBeforeRet, as it requires the killing MemoryDef as starting instruction, making the caching ineffective. But it appears the use of PointerMayBeCapturedBefore has very limited benefits in practice (e.g. on SPEC2000/SPEC2006/MultiSource there are no binary changes with -O3 -flto). Refrain from using it for now, to limit-compile-time. This gives some nice compile-time improvements: http://llvm-compile-time-tracker.com/compare.php?from=db9345f6810f379a36752dc52caf5230585d0ebd&to=b4d091047e1b8a3d377d200137b79d03aca65663&stat=instructions
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