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This is simply to get cleaner testsuite results on aarch64.
The following upstream patch will make sure that the testsuite doesn't produce lots of failures for the unsupported exp-sgcheck tool:

commit 59784c512ec40e588b21cf5ae8e31e9c4f99d6b8
Author: Mark Wielaard <mark>
Date:   Sat May 18 14:55:50 2019 +0200

    aarch64 (arm64) isn't a supported architecture for exp-sgcheck.
    
    exp-sgcheck/pc_main.c contains:
    
       #if defined(VGA_arm) || defined(VGA_arm64)
          VG_(printf)("SGCheck doesn't work on ARM yet, sorry.\n");
          VG_(exit)(1);
       #endif
    
    But exp-sgcheck/tests/is_arch_supported checked against uname -m
    which returns aarch64 (not arm64). Fix the test check so the
    exp-sgcheck tests are skipped instead of producing failures.

diff --git a/exp-sgcheck/tests/is_arch_supported b/exp-sgcheck/tests/is_arch_sup
index 818cc61..d4c6191 100755
--- a/exp-sgcheck/tests/is_arch_supported
+++ b/exp-sgcheck/tests/is_arch_supported
@@ -10,6 +10,6 @@
 # architectures.
 
 case `uname -m` in
-  ppc*|arm*|s390x|mips*) exit 1;;
+  ppc*|aarch64|arm*|s390x|mips*) exit 1;;
   *)         exit 0;;
 esac

I verified exp-sgcheck tests are ignored by the testsuite on aarch64 for valgrind-3.15.0-5.el8 and fails for valgrind-3.15.0-3.el8.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2019:3346