[ValueTracking] do not overwrite analysis results already computed
Summary: ValueTracking used to overwrite the analysis results computed from assumes and dominating conditions. This patch fixes this issue. Test Plan: test/Analysis/ValueTracking/assume.ll Reviewers: hfinkel, majnemer Reviewed By: majnemer Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10283 llvm-svn: 239718
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