Adjust libsanitizer to ABI change in glibc 2.31.

Adapted to 3.x 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
@@ -1139,8 +1139,9 @@ 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/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
@@ -194,17 +194,16 @@ namespace __sanitizer {
     unsigned __seq;
     u64 __unused1;
     u64 __unused2;
-#elif defined(__mips__) || defined(__aarch64__) || defined(__s390x__)
-    unsigned int mode;
-    unsigned short __seq;
-    unsigned short __pad1;
-    unsigned long __unused1;
-    unsigned long __unused2;
+#elif defined(__sparc__)
+  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;
></tr></table>
<div class='path'>path: <a href='/guix/log/?id=ee25e3fcab9d2e24c2826b771b52d797c152193b'>root</a>/<a href='/guix/log/gnu?id=ee25e3fcab9d2e24c2826b771b52d797c152193b'>gnu</a>/<a href='/guix/log/gnu/packages?id=ee25e3fcab9d2e24c2826b771b52d797c152193b'>packages</a>/<a href='/guix/log/gnu/packages/search.scm?id=ee25e3fcab9d2e24c2826b771b52d797c152193b'>search.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/packages/search.scm?id=ee25e3fcab9d2e24c2826b771b52d797c152193b&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-04-27 15:54:00 +0200'>2021-04-27</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=19f67a9197c41892e8e37020816a4f7f337d7e8d'>gnu: ugrep: Use GIT-FILE-NAME helper.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (ugrep)[source]: Use GIT-FILE-NAME.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-04-27 15:54:00 +0200'>2021-04-27</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=4206cf1fa89deb0f30b7b5e3147b059a9908db6a'>gnu: ugrep: Update to 3.1.12.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (ugrep): Update to 3.1.12.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-04-04 15:16:45 +0200'>2021-04-04</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=aaec5de3a7bcef35421bc801e0f747daa8dbfb5c'>gnu: ugrep: Update to 3.1.11.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (ugrep): Update to 3.1.11.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-01-27 16:43:51 +0100'>2021-01-27</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=d8aa4444688ce244d2556630c3f7cfe739e01310'>gnu: Add ugrep.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (ugrep): New Variable.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2021-01-18 01:34:53 +0100'>2021-01-18</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=cbc2c28ad4337781c679b7588a74740b2ba7d189'>gnu: xapian, python-xapian-bindings: Update to 1.4.18.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (xapian, python-xapian-bindings): Update to 1.4.18.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2021-01-03 06:55:40 +0100'>2021-01-03</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=78a9cfa33e66c5647cea66980d83f49a43e27f60'>gnu: perl-search-xapian: Update to 1.2.25.4.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (perl-search-xapian): Update to 1.2.25.4.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-08-24 04:36:51 +0200'>2020-08-24</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=5e9e232c847468f228389f07344eac317af4650c'>gnu: xapian: Update to 1.4.17.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (xapian, python-xapian-bindings): Update to
1.4.17.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2020-06-14 00:05:10 +0200'>2020-06-14</span></td><td><a href='/guix/commit/gnu/packages/search.scm?id=238e2e457fdbd25798f1eb5d854d70c37e6ad1f8'>gnu: xapian: Update to 1.4.16.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/search.scm (xapian): Update to 1.4.16.
(python-xapian-bindings)[source]: Update content hash.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>