[libc++] Promote GCC 11 to mandatory CI
Also, fix the last issue that prevented GCC 11 from passing the test
suite. Thanks to everyone else who fixed issues.
Differential Revision: https://reviews.llvm.org/D104315
GitOrigin-RevId: 4f194d0db78f612233234a7db659384cd62709fb
diff --git a/test/catch_member_function_pointer_02.pass.cpp b/test/catch_member_function_pointer_02.pass.cpp
index d203fe3..f92035b 100644
--- a/test/catch_member_function_pointer_02.pass.cpp
+++ b/test/catch_member_function_pointer_02.pass.cpp
@@ -12,7 +12,7 @@
// GCC 7 and 8 support noexcept function types but this test still fails.
// This is likely a bug in their implementation. Investigation needed.
-// XFAIL: gcc-7, gcc-8, gcc-9, gcc-10
+// XFAIL: gcc-7, gcc-8, gcc-9, gcc-10, gcc-11
#include <cassert>
