Extract loplugin:redundantcast from loplugin:cstylecast

Change-Id: I08f17dd9cc092206083ff41bbbc178e0322e86d0

compilerplugins/clang/cstylecast.cxx

@@ -47,8 +47,6 @@ public:
 
     bool VisitCStyleCastExpr(const CStyleCastExpr * expr);
 
-    bool VisitImplicitCastExpr(ImplicitCastExpr const * expr);
-
 private:
     bool externCFunction;
 };
@@ -135,32 +133,6 @@ bool CStyleCast::VisitCStyleCastExpr(const CStyleCastExpr * expr) {
     return true;
 }
 
-bool CStyleCast::VisitImplicitCastExpr(const ImplicitCastExpr * expr) {
-    if (ignoreLocation(expr) || expr->getCastKind() != CK_BitCast) {
-        return true;
-    }
-    QualType t = expr->getType();
-    if (!(t->isPointerType()
-          && t->getAs<PointerType>()->getPointeeType()->isVoidType()
-          && expr->getSubExpr()->getType()->isPointerType()))
-    {
-        return true;
-    }
-    Expr const * e = expr->getSubExpr()->IgnoreParenImpCasts();
-    while (isa<CXXConstCastExpr>(e)) {
-        e = dyn_cast<CXXConstCastExpr>(e)->getSubExpr()->IgnoreParenImpCasts();
-    }
-    if (isa<CXXReinterpretCastExpr>(e)) {
-        report(
-            DiagnosticsEngine::Warning,
-            ("redundant reinterpret_cast, result is implicitly cast to void"
-             " pointer"),
-            e->getExprLoc())
-            << e->getSourceRange();
-    }
-    return true;
-}
-
 loplugin::Plugin::Registration< CStyleCast > X("cstylecast");
 
 }