Adjust libsanitizer to ABI change in glibc 2.31.

Taken from this upstream commit:
https://github.com/llvm/llvm-project/commit/947f9692440836dcb8d88b74b69dd379d85974ce

diff --git a/lib/sanitizer_common/sanitizer_platform_limits_posix.cc b/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
--- a/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
+++ b/lib/sanitizer_common/sanitizer_platform_limits_posix.cc
@@ -1126,8 +1126,9 @@ CHECK_SIZE_AND_OFFSET(ipc_perm, uid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, gid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cuid);
 CHECK_SIZE_AND_OFFSET(ipc_perm, cgid);
-#if !defined(__aarch64__) || !SANITIZER_LINUX || __GLIBC_PREREQ (2, 21)
-/* On aarch64 glibc 2.20 and earlier provided incorrect mode field.  */
+#if !SANITIZER_LINUX || __GLIBC_PREREQ (2, 31)
+/* glibc 2.30 and earlier provided 16-bit mode field instead of 32-bit
+   on many architectures.  */
 CHECK_SIZE_AND_OFFSET(ipc_perm, mode);
 #endif
 
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h b/compiler-rt/lib/sanitizer_common/sanitizer_platform_limits_posix.h
--- a/lib/sanitizer_common/sanitizer_platform_limits_posix.h
+++ b/lib/sanitizer_common/sanitizer_platform_limits_posix.h
@@ -203,28 +203,15 @@ namespace __sanitizer {
     u64 __unused1;
     u64 __unused2;
 #elif defined(__sparc__)
-#if defined(__arch64__)
-    unsigned mode;
-    unsigned short __pad1;
-#else
-    unsigned short __pad1;
-    unsigned short mode;
-    unsigned short __pad2;
-#endif
-    unsigned short __seq;
-    unsigned long long __unused1;
-    unsigned long long __unused2;
-#elif defined(__mips__) || defined(__aarch64__) || defined(__s390x__)
-    unsigned int mode;
-    unsigned short __seq;
-    unsigned short __pad1;
-    unsigned long __unused1;
-    unsigned long __unused2;
+  unsigned mode;
+  unsigned short __pad2;
+  unsigned short __seq;
+  unsigned long long __unused1;
+  unsigned long long __unused2;
 #else
-    unsigned short mode;
-    unsigned short __pad1;
-    unsigned short __seq;
-    unsigned short __pad2;
+  unsigned int mode;
+  unsigned short __seq;
+  unsigned short __pad2;
 #if defined(__x86_64__) && !defined(_LP64)
     u64 __unused1;
     u64 __unused2;
10e51d6dde2293ed5f5bf95d505c0b89c5db8f89'>services</a>/<a href='/guix/log/gnu/services/pam-mount.scm?id=10e51d6dde2293ed5f5bf95d505c0b89c5db8f89'>pam-mount.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/pam-mount.scm?id=10e51d6dde2293ed5f5bf95d505c0b89c5db8f89&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-06-17 10:30:41 +0200'>2022-06-17</span></td><td><a href='/guix/commit/gnu/services/pam-mount.scm?id=530e0f02606a0e04818bdd792bb5239f7ee9e637'>gnu: base: Add greetd-service-type.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/base.scm (greetd-service-type): New variable
* gnu/services/base.scm (greetd-configuration): New data type
* gnu/services/base.scm (greetd-terminal-configuration): New data type
* gnu/services/base.scm (greetd-agreety-session): New data type
* gnu/services/base.scm (pam-limits-service-type): Should be aware of
greetd PAM service
* gnu/services/pam-mount.scm (pam-mount-pam-service): Should be aware
of greetd PAM service

Signed-off-by: Lars-Dominik Braun &lt;ldb@leibniz-psychology.org&gt;
</span></span></td><td>muradm</td></tr>
<tr><td><span title='2022-01-17 00:13:46 +0100'>2022-01-17</span></td><td><a href='/guix/commit/gnu/services/pam-mount.scm?id=757be0e8af0805ea354a7003a1e2b71475caf9ae'>services: pam-mount: Add support for sddm login manager.</a><span class='msg-avail'>...<span class='msg-tooltip'>I noticed that pam_mount mounts work fine when loging into a textual
session, but not when using sddm. This patch fixes this problem by
ensuring that pam_mount.so is included in /etc/pam.d/sddm config file.

* gnu/services/pam-mount.scm (pam-mount-pam-service): Add sddm to the list of
  pam services.

Signed-off-by: Guillaume Le Vaillant &lt;glv@posteo.net&gt;
</span></span></td><td>Nick Zalutskiy</td></tr>