[Analyzer][solver] Remove unused functions

[martong]

Summary

../../git/llvm-project/clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp:2395:17: warning: 'clang::ento::ProgramStateRef {anonymous}::RangeConstraintManager::setRange(clang::ento::ProgramStateRef, {anonymous}::EquivalenceClass, clang::ento::RangeSet)' defined but not used [-Wunused-function]
../../git/llvm-project/clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp:2384:10: warning: 'clang::ento::RangeSet {anonymous}::RangeConstraintManager::getRange(clang::ento::ProgramStateRef, {anonymous}::EquivalenceClass)' defined but not used [-Wunused-function]

[vsavchenko]

Yes, let's do this! Thanks for addressing it!

clang/lib/StaticAnalyzer/Core/RangeConstraintManager.cpp

RangeConstraintManager::removeDeadBindings(ProgramStateRef State,
   return State;
 }
 
 RangeSet RangeConstraintManager::getRange(ProgramStateRef State,
                                           SymbolRef Sym) {
   return SymbolicRangeInferrer::inferRange(F, State, Sym);
 }
 
-RangeSet RangeConstraintManager::getRange(ProgramStateRef State,
-                                          EquivalenceClass Class) {
-  return SymbolicRangeInferrer::inferRange(F, State, Class);
-}
-
 ProgramStateRef RangeConstraintManager::setRange(ProgramStateRef State,
                                                  SymbolRef Sym,
                                                  RangeSet Range) {
   return ConstraintAssignor::assign(State, getSValBuilder(), F, Sym, Range);
 }
 
-ProgramStateRef RangeConstraintManager::setRange(ProgramStateRef State,
-                                                 EquivalenceClass Class,
-                                                 RangeSet Range) {
-  return ConstraintAssignor::assign(State, getSValBuilder(), F, Class, Range);
-}
-
 //===------------------------------------------------------------------------===
 // assumeSymX methods: protected interface for RangeConstraintManager.
 //===------------------------------------------------------------------------===/
 
 // The syntax for ranges below is mathematical, using [x, y] for closed ranges
 // and (x, y) for open ranges. These ranges are modular, corresponding with
 // a common treatment of C integer overflow. This means that these methods
 // do not have to worry about overflow; RangeSet::Intersect can handle such a