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from b9f324c2611 [InstCombine] add fold for fabs(X) u< 0.0 new 3125e351406 Add support for llvm.is.constant intrinsic (PR4898) new 8c397800298 [InstCombine] add tests for more fcmp+fabs preds; NFC

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Summary of changes: docs/LangRef.rst | 45 +++++++++ include/llvm/Analysis/TargetTransformInfoImpl.h | 1 + include/llvm/IR/Intrinsics.td | 4 + lib/Analysis/ConstantFolding.cpp | 22 +++++ lib/CodeGen/CodeGenPrepare.cpp | 43 ++++++--- lib/CodeGen/GlobalISel/IRTranslator.cpp | 5 + lib/CodeGen/SelectionDAG/FastISel.cpp | 8 ++ lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 7 ++ lib/Transforms/Scalar/SCCP.cpp | 2 + test/CodeGen/Generic/is-constant.ll | 114 +++++++++++++++++++++++ test/CodeGen/X86/is-constant.ll | 50 ++++++++++ test/Transforms/InstCombine/fcmp.ll | 22 +++++ test/Transforms/SCCP/ipsccp-basic.ll | 13 +++ 13 files changed, 322 insertions(+), 14 deletions(-) create mode 100644 test/CodeGen/Generic/is-constant.ll create mode 100644 test/CodeGen/X86/is-constant.ll