More loplugin::TypeCheck use

Change-Id: I2f4a26a918134568f541cd45bdcf5a12b1f1d2ee

compilerplugins/clang/getimplementationname.cxx

@@ -20,6 +20,7 @@
 #include <fstream>
 #include <regex>
 #include "plugin.hxx"
+#include "typecheck.hxx"
 #include "clang/Frontend/CompilerInstance.h"
 
 namespace {
@@ -45,11 +46,6 @@ clang::Expr const * ignoreParenImplicitComma(clang::Expr const * expr) {
     }
 }
 
-bool isPlainChar(clang::QualType type) {
-    return type->isSpecificBuiltinType(clang::BuiltinType::Char_S)
-        || type->isSpecificBuiltinType(clang::BuiltinType::Char_U);
-}
-
 bool overridesXServiceInfo(clang::CXXMethodDecl const * decl) {
     for (auto i = decl->begin_overridden_methods();
          i != decl->end_overridden_methods(); ++i)
@@ -145,7 +141,8 @@ bool GetImplementationName::isStringConstant(
 {
     QualType t = expr->getType();
     if (!(t->isConstantArrayType() && t.isConstQualified()
-          && isPlainChar(t->getAsArrayTypeUnsafe()->getElementType())))
+          && (loplugin::TypeCheck(t->getAsArrayTypeUnsafe()->getElementType())
+              .Char())))
     {
         return false;
     }