Add test for TSan segfault

Author: BStott6

compiler-rt/test/tsan/target_clones_segfault.c

@@ -0,0 +1,10 @@
+// https://github.com/llvm/llvm-project/issues/163369
+// RUN: %clang %s -fsanitize=thread -o %t
+// RUN: %t
+
+__attribute__((target_clones("default,avx"))) static int
+has_target_clones(void) {
+  return 0;
+}
+
+int main(void) { has_target_clones(); }