[Clang] XFAIL sanitize-coverage-old-pm.c on 32bit Armv8l

sanitize-coverage-old-pm.c started failing on arm 32 bit where
underlying architecture reported is armv8l fore 32bit arm.
This patch XFAILS sanitize-coverage-old-pm.c on armv8l similar
to armv7 and thumbv7.

Author: omjavaid

clang/test/CodeGen/sanitize-coverage-old-pm.c

@@ -6,7 +6,7 @@
 // RUN: %clang %s -target x86_64-unknown-linux-gnu -emit-llvm -S -fsanitize=undefined  -fsanitize-coverage=trace-pc,trace-cmp -o - -flegacy-pass-manager | FileCheck %s --check-prefixes=CHECK,UBSAN
 //
 // Host armv7 is currently unsupported: https://bugs.llvm.org/show_bug.cgi?id=46117
-// XFAIL: armv7, thumbv7
+// XFAIL: armv7, thumbv7, armv8l
 // The same issue also occurs on a riscv32 host.
 // XFAIL: riscv32