[HIPIFY][fix][#1109] Do not preserve extern __shared__ for IncompleteArrayType

+ Update tests accordingly

tests/hipify-clang/unit_tests/samples/dynamic_shared_memory.cu

@@ -9,6 +9,7 @@
 __global__ void dynamicReverse(int *d, int n)
 {
   // Dynamic shared memory
+  // CHECK-NOT: extern __shared__
   // CHECK: HIP_DYNAMIC_SHARED(int, s);
   extern __shared__ int s[];
   int t = threadIdx.x;

tests/hipify-clang/unit_tests/samples/static_shared_memory.cu

@@ -8,6 +8,8 @@
 
 __global__ void staticReverse(int *d, int n)
 {
+  // CHECK-NOT: HIP_DYNAMIC_SHARED(int, s);
+  // CHECK: __shared__ int s[64];
   __shared__ int s[64];
   int t = threadIdx.x;
   int tr = n-t-1;