[libc++] Temporarily mark tests as UNSUPPORTED to get the CI green

After recent changes to the Docker image, all hell broke loose and the
CI started failing. This patch marks a few tests as unsupported until
we can figure out what the issues are and fix them.

In the future, it would be ideal if the nodes could pick up the Dockerfile
present in the revision being tested, which would allow us to test changes
to the Dockerfile in the CI, like we do for all other code changes.

Differential Revision: https://reviews.llvm.org/D112737

GitOrigin-RevId: a55632a069d89804938d7ef33192888f539b3bc8
diff --git a/test/remember_state_leak.pass.sh.s b/test/remember_state_leak.pass.sh.s
index fceac21..b98a91d 100644
--- a/test/remember_state_leak.pass.sh.s
+++ b/test/remember_state_leak.pass.sh.s
@@ -8,9 +8,6 @@
 // TODO: Investigate this failure
 // XFAIL: 32bits-on-64bits
 
-# TODO: Investigate this failure on GCC.
-# XFAIL: gcc
-
 # The following assembly is a translation of this code:
 #
 #   _Unwind_Reason_Code callback(int, _Unwind_Action, long unsigned int,