[Analyzer] Remove undefined function

This getLValue function was declared in 98db1f9 ([Analyzer] [NFC]
Parameter Regions, 2020-05-11) but was never implemented.

Reviewed By: NoQ

Differential Revision: https://reviews.llvm.org/D124461

Author: marco-antognini-sonarsource

clang/include/clang/StaticAnalyzer/Core/PathSensitive/ProgramState.h

@@ -306,10 +306,6 @@ class ProgramState : public llvm::FoldingSetNode {
   Loc getLValue(const CXXRecordDecl *BaseClass, const SubRegion *Super,
                 bool IsVirtual) const;
 
-  /// Get the lvalue for a parameter.
-  Loc getLValue(const Expr *Call, unsigned Index,
-                const LocationContext *LC) const;
-
   /// Get the lvalue for a variable reference.
   Loc getLValue(const VarDecl *D, const LocationContext *LC) const;