[PATCH] D136668: [clang][dataflow] Add initial sign analysis

[Gabor Marton via Phabricator via cfe-commits]

martong created this revision.
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This patch adds an initial implementation for sign analysis, with the
following lattice (T: top, N: negative, Z: zero, P: positive, B: bottom):

  T

/ | \
N Z P
\ | /

  B

The lattice is implemented with `BoolValue` properties attached to other
`Value`s.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136668

Files:
  clang/unittests/Analysis/FlowSensitive/CMakeLists.txt
  clang/unittests/Analysis/FlowSensitive/SignAnalysisTest.cpp

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