[LIT] Run check_device_code/vector/vector_math_ops only when assertions are enabled (#13611)

Fixes the post-commit failure:
https://github.com/intel/llvm/actions/runs/8902870243/job/24449594832

Author: uditagarwal97

sycl/test/check_device_code/vector/vector_math_ops.cpp

@@ -5,6 +5,8 @@
 
 // RUN: %clangxx -I %sycl_include -S -emit-llvm -fno-sycl-instrument-device-code -Xclang -disable-lifetime-markers -fsycl-device-only %s -o - | FileCheck %s
 
+// REQUIRES: asserts
+
 // This test checks
 // (1) the storage type of sycl::vec on device for all data types, and
 // (2) the device code for various math operations on sycl::vec.