[clang] [CIR][SYCL][NFC] Add functionptr-addrspace test (PR #230327)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Konstantinos Parasyris (koparasy)

<details>
<summary>Changes</summary>

Port clang/test/CodeGenSYCL/functionptr-addrspace.cpp to ClangIR.

---
Full diff: https://github.com/llvm/llvm-project/pull/230327.diff


1 Files Affected:

- (added) clang/test/CIR/CodeGenSYCL/functionptr-addrspace.cpp (+33) 


``````````diff
diff --git a/clang/test/CIR/CodeGenSYCL/functionptr-addrspace.cpp b/clang/test/CIR/CodeGenSYCL/functionptr-addrspace.cpp
new file mode 100644
index 00000000000000..266dc4e18254f2
--- /dev/null
+++ b/clang/test/CIR/CodeGenSYCL/functionptr-addrspace.cpp
@@ -0,0 +1,33 @@
+// RUN: %clang_cc1 -fsycl-is-device -triple spir64 -verify -fclangir -emit-cir %s -o %t.cir
+// RUN: FileCheck --input-file=%t.cir %s -check-prefix=CIR
+// RUN: %clang_cc1 -fsycl-is-device -triple spir64 -verify -fclangir -emit-llvm %s -o %t-cir.ll
+// RUN: FileCheck --input-file=%t-cir.ll %s -check-prefix=LLVM
+// RUN: %clang_cc1 -fsycl-is-device -triple spir64 -verify -emit-llvm %s -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=LLVM
+
+// expected-no-diagnostics
+
+template <typename Name, typename Func>
+__attribute__((sycl_kernel)) void kernel_single_task(const Func &kernelFunc) {
+  kernelFunc();
+}
+
+// Function pointers stay in the program address space (0); data pointers use
+// the generic address space (4).
+// CIR: cir.func {{.*}}@_Z15invoke_functionPFivEPi(%{{.*}}: !cir.ptr<!cir.func<() -> !s32i>> {{.*}}, %{{.*}}: !cir.ptr<!s32i, target_address_space(4)> {{.*}}) cc(spir_function)
+// LLVM: define dso_local spir_func{{.*}}invoke_function{{.*}}(ptr noundef %{{.*}}, ptr addrspace(4) noundef %{{.*}})
+[[clang::sycl_external]] void invoke_function(int (*fptr)(), int *ptr) {}
+
+int f() { return 0; }
+
+int main() {
+  kernel_single_task<class fake_kernel>([=]() {
+    int (*p)() = f;
+    int (&r)() = *p;
+    int a = 10;
+    invoke_function(p, &a);
+    invoke_function(r, &a);
+    invoke_function(f, &a);
+  });
+  return 0;
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/230327