update err_typecheck_subscript_not_integer to indicate array or matrix

Author: farzonl

clang/lib/Sema/SemaExpr.cpp

@@ -5334,6 +5334,7 @@ Sema::CreateBuiltinArraySubscriptExpr(Expr *Base, SourceLocation LLoc,
   // C99 6.5.2.1p1
   if (!IndexExpr->getType()->isIntegerType() && !IndexExpr->isTypeDependent())
     return ExprError(Diag(LLoc, diag::err_typecheck_subscript_not_integer)
+                     << /*array*/ 0
                      << IndexExpr->getSourceRange());
 
   if ((IndexExpr->getType()->isSpecificBuiltinType(BuiltinType::Char_S) ||
@@ -16261,6 +16262,7 @@ ExprResult Sema::BuildBuiltinOffsetOf(SourceLocation BuiltinLoc,
           !Idx->getType()->isIntegerType())
         return ExprError(
             Diag(Idx->getBeginLoc(), diag::err_typecheck_subscript_not_integer)
+            << /*array*/ 0
             << Idx->getSourceRange());
 
       // Record this array index.