[HIPIFY][#1487][fix] Translate correctly kernel names prefixed with namespace

+ Modify CUDA2HIP_perl for the fix
+ Add ns_kernel_launch.cu test
+ Update hipify-perl by hipify-clang -perl


[ROCm/hip commit: 3286ffdfc0]

projects/hip/tests/hipify-clang/unit_tests/namespace/ns_kernel_launch.cu

@@ -0,0 +1,28 @@
+// RUN: %run_test hipify "%s" "%t" %hipify_args %clang_args
+// CHECK: #include <hip/hip_runtime.h>
+#include <cuda.h>
+
+__global__ void test_0() {
+  int a = 10;
+}
+
+namespace first {
+  __global__ void test_1() {
+    int b = 20;
+  }
+  namespace second {
+    __global__ void test_2() {
+      int c = 30;
+    }
+  }
+}
+
+int main() {
+  // CHECK: hipLaunchKernelGGL(::test_0, dim3(1), dim3(1), 0, 0);
+  ::test_0<<<1, 1>>>();
+  // CHECK: hipLaunchKernelGGL(first::test_1, dim3(1), dim3(1), 0, 0);
+  first::test_1<<<1, 1>>>();
+  // CHECK: hipLaunchKernelGGL(first::second::test_2, dim3(1), dim3(1), 0, 0);
+  first::second::test_2<<<1, 1>>>();
+  return 0;
+}