[llvm-exegesis] Disable test

This patch disables the skip unsupported instructions test on AArch64. On
machines that have hardware support for pointer authentication the test will
try and disable certain features, but currently fails depending upon the
configuration.

Author: boomanaiden154

llvm/test/tools/llvm-exegesis/AArch64/skip_unsupported_instructions.s

@@ -1,10 +1,14 @@
 llvm/test/tools/llvm-exegesis/AArch64/skip_unsupported_instructions.s
 
+# TODO: This is failing on some systems that have hardware support for
+# pointer authentication. This needs to be fixed before reenabling.
+# REQUIRES: disabled
+
 # REQUIRES: aarch64-registered-target
 
 # Check for skipping of illegal instruction errors (AUT and LDGM)
 # RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --opcode-name=AUTIA --benchmark-phase=assemble-measured-code 2>&1 | FileCheck %s --check-prefix=CHECK-AUTIA
 # CHECK-AUTIA-NOT: snippet crashed while running: Illegal instruction
 
 # RUN: llvm-exegesis -mcpu=neoverse-v2 -mode=latency --opcode-name=LDGM --benchmark-phase=assemble-measured-code 2>&1 | FileCheck %s --check-prefix=CHECK-LDGM
-# CHECK-LDGM: LDGM: Unsupported opcode: load tag multiple 
+# CHECK-LDGM: LDGM: Unsupported opcode: load tag multiple