transform/msl: Run InlinePointerLets and Simplify

This will be relied on by the upcoming arrayLength transform.

Update test expectations.

Change-Id: Ib74b647abcd6f4393f9899ce40bbf06f6e53e7f4
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/55180
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/test/array/assign_to_subexpr.wgsl.expected.msl b/test/array/assign_to_subexpr.wgsl.expected.msl
index 2b62433..9b47792 100644
--- a/test/array/assign_to_subexpr.wgsl.expected.msl
+++ b/test/array/assign_to_subexpr.wgsl.expected.msl
@@ -16,13 +16,10 @@
   tint_array_wrapper dst = {};
   S dst_struct = {};
   tint_array_wrapper_1 dst_array = {};
-  thread tint_array_wrapper* const dst_ptr = &(dst);
-  thread S* const dst_struct_ptr = &(dst_struct);
-  thread tint_array_wrapper_1* const dst_array_ptr = &(dst_array);
   dst_struct.arr = src;
   dst_array.arr[1] = src;
-  *(dst_ptr) = src;
-  (*(dst_struct_ptr)).arr = src;
-  (*(dst_array_ptr)).arr[0] = src;
+  dst = src;
+  dst_struct.arr = src;
+  dst_array.arr[0] = src;
 }