Add test to check if "unreachable" instruction is emitted for sycl devices

Author: srividya-sundaram

clang/test/CodeGenSYCL/remove-ur-inst.cpp

@@ -0,0 +1,19 @@
+// RUN: %clang_cc1 -fsycl -fsycl-is-device -triple spir64-unknown-unknown-sycldevice -emit-llvm %s -o - | FileCheck %s
+
+
+SYCL_EXTERNAL void doesNotReturn ()
+     throw () __attribute__ ((__noreturn__));
+
+
+template <typename name, typename Func>
+__attribute__((sycl_kernel)) void kernel(Func kernelFunc) {
+  kernelFunc();
+}
+
+int main() {
+  kernel<class test>([]() {
+    doesNotReturn();
+    // CHECK-NOT: unreachable
+  });
+  return 0;
+}