[BOLT][AArch64] Skip gadget pacret test on RHEL8

Author: paschalis-mpeis

bolt/test/binary-analysis/AArch64/gs-pacret-autiasp.s

@@ -1,3 +1,5 @@
+// REQUIRES: !rhel8
+
 // RUN: %clang %cflags -march=armv9.5-a+pauth-lr -mbranch-protection=pac-ret %s %p/../../Inputs/asm_main.c -o %t.exe
 // RUN: llvm-bolt-binary-analysis --scanners=pacret %t.exe 2>&1 | FileCheck %s
 
@@ -883,4 +885,3 @@ f_autib171615:
 // CHECK-NEXT: {{[0-9a-f]+}}:   ret
         ret
         .size f_autib171615, .-f_autib171615
-

bolt/test/lit.cfg.py

@@ -75,6 +75,11 @@
 if lit.util.which("fuser"):
     config.available_features.add("fuser")
 
+rhel_release="/etc/redhat-release"
+if os.path.exists(rhel_release) and \
+    "release 8" in open(rhel_release).read().lower():
+    config.available_features.add("rhel8")
+
 llvm_config.use_default_substitutions()
 
 llvm_config.config.environment["CLANG"] = config.bolt_clang