Revert "[llvm] add GenericFloatingPointPredicateUtils (#140254)" (#140968)

This reverts commit d00d74b. 

The PR breaks our buildbots and blocks downstream merge.

Author: Kewen12

llvm/include/llvm/ADT/GenericFloatingPointPredicateUtils.h

@@ -213,6 +213,49 @@ Intrinsic::ID getIntrinsicForCallSite(const CallBase &CB,
 bool isSignBitCheck(ICmpInst::Predicate Pred, const APInt &RHS,
                     bool &TrueIfSigned);
 
+/// Returns a pair of values, which if passed to llvm.is.fpclass, returns the
+/// same result as an fcmp with the given operands.
+///
+/// If \p LookThroughSrc is true, consider the input value when computing the
+/// mask.
+///
+/// If \p LookThroughSrc is false, ignore the source value (i.e. the first pair
+/// element will always be LHS.
+std::pair<Value *, FPClassTest> fcmpToClassTest(CmpInst::Predicate Pred,
+                                                const Function &F, Value *LHS,
+                                                Value *RHS,
+                                                bool LookThroughSrc = true);
+std::pair<Value *, FPClassTest> fcmpToClassTest(CmpInst::Predicate Pred,
+                                                const Function &F, Value *LHS,
+                                                const APFloat *ConstRHS,
+                                                bool LookThroughSrc = true);
+
+/// Compute the possible floating-point classes that \p LHS could be based on
+/// fcmp \Pred \p LHS, \p RHS.
+///
+/// \returns { TestedValue, ClassesIfTrue, ClassesIfFalse }
+///
+/// If the compare returns an exact class test, ClassesIfTrue == ~ClassesIfFalse
+///
+/// This is a less exact version of fcmpToClassTest (e.g. fcmpToClassTest will
+/// only succeed for a test of x > 0 implies positive, but not x > 1).
+///
+/// If \p LookThroughSrc is true, consider the input value when computing the
+/// mask. This may look through sign bit operations.
+///
+/// If \p LookThroughSrc is false, ignore the source value (i.e. the first pair
+/// element will always be LHS.
+///
+std::tuple<Value *, FPClassTest, FPClassTest>
+fcmpImpliesClass(CmpInst::Predicate Pred, const Function &F, Value *LHS,
+                 Value *RHS, bool LookThroughSrc = true);
+std::tuple<Value *, FPClassTest, FPClassTest>
+fcmpImpliesClass(CmpInst::Predicate Pred, const Function &F, Value *LHS,
+                 FPClassTest RHS, bool LookThroughSrc = true);
+std::tuple<Value *, FPClassTest, FPClassTest>
+fcmpImpliesClass(CmpInst::Predicate Pred, const Function &F, Value *LHS,
+                 const APFloat &RHS, bool LookThroughSrc = true);
+
 /// Determine which floating-point classes are valid for \p V, and return them
 /// in KnownFPClass bit sets.
 ///

llvm/include/llvm/Analysis/FloatingPointPredicateUtils.h

@@ -74,7 +74,6 @@ add_llvm_component_library(LLVMAnalysis
   DXILResource.cpp
   DXILMetadataAnalysis.cpp
   EphemeralValuesCache.cpp
-  FloatingPointPredicateUtils.cpp
   FunctionPropertiesAnalysis.cpp
   GlobalsModRef.cpp
   GuardUtils.cpp

llvm/include/llvm/Analysis/ValueTracking.h

@@ -26,7 +26,6 @@
 #include "llvm/Analysis/CaptureTracking.h"
 #include "llvm/Analysis/CmpInstAnalysis.h"
 #include "llvm/Analysis/ConstantFolding.h"
-#include "llvm/Analysis/FloatingPointPredicateUtils.h"
 #include "llvm/Analysis/InstSimplifyFolder.h"
 #include "llvm/Analysis/Loads.h"
 #include "llvm/Analysis/LoopAnalysisManager.h"