Update LLVM to a newer version

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

build/llvm/LLVM-commit

@@ -1 +1 @@
-51d3cb0ab15de7acb7131b5f967cf7fc84def99e
+791523bae6153b13bb41ba05c9fc89e502cc4a1a

src/CppParser/Parser.cpp

@@ -2828,6 +2828,12 @@ Type* Parser::WalkType(clang::QualType QualType, const clang::TypeLoc* TL,
         Ty = UTT;
         break;
     }
+    case clang::Type::TypeClass::Using:
+    {
+        auto U = Type->getAs<clang::UsingType>();
+        Ty = WalkType(U->getUnderlyingType(), TL);
+        break;
+    }
     case clang::Type::Vector:
     {
         auto V = Type->getAs<clang::VectorType>();