[StaticAnalyzer] Remove unused declaration evalLoadCommon

The corresponding function definition was removed by:

  commit e0fb481
  Author: Artem Dergachev <[email protected]>
  Date:   Fri May 4 23:01:10 2018 +0000

Author: kazutakahirata

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

@@ -773,15 +773,6 @@ class ExprEngine {
   void finishArgumentConstruction(ExplodedNodeSet &Dst, ExplodedNode *Pred,
                                   const CallEvent &Call);
 
-  void evalLoadCommon(ExplodedNodeSet &Dst,
-                      const Expr *NodeEx,  /* Eventually will be a CFGStmt */
-                      const Expr *BoundEx,
-                      ExplodedNode *Pred,
-                      ProgramStateRef St,
-                      SVal location,
-                      const ProgramPointTag *tag,
-                      QualType LoadTy);
-
   void evalLocation(ExplodedNodeSet &Dst,
                     const Stmt *NodeEx, /* This will eventually be a CFGStmt */
                     const Stmt *BoundEx,