Add release note and test.

Author: 16bit-ykiko

clang/docs/ReleaseNotes.rst

@@ -695,6 +695,8 @@ Bug Fixes to Compiler Builtins
 
 - Fix ``__has_builtin`` incorrectly returning ``false`` for some C++ type traits. (#GH111477)
 
+- Fix ``__builtin_source_location`` incorrectly returning wrong column for method chains. (#GH119129)
+
 Bug Fixes to Attribute Support
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 

clang/test/SemaCXX/source_location.cpp

@@ -1012,3 +1012,21 @@ int h = Var<int>;
 
 
 }
+
+namespace GH119129 {
+struct X{
+  constexpr int foo(std::source_location loc = std::source_location::current()) {
+    return loc.line();
+  }
+};
+static_assert(X{}.foo() == __LINE__);
+static_assert(X{}.
+                foo() ==__LINE__);
+static_assert(X{}.
+
+
+                foo() ==__LINE__);
+#line 10000
+static_assert(X{}.
+                foo() == 10001);
+}