Initial element access compilation; Carefully approaching std array

tests/compiler/std/carray.ts

@@ -0,0 +1,26 @@
+// TBD: While this is useful as long as the pointer is just a local or global,
+// things go haywire, compared to C, as soon as the CArray is a member of a
+// class. Also, multi dimensional arrays cannot be implemented C-like because
+// their length isn't known at compile time.
+
+var arr: CArray<i32> = changetype<CArray<i32>>(HEAP_BASE);
+
+assert(load<i32>(HEAP_BASE) == 0);
+assert(load<i32>(HEAP_BASE + 4) == 0);
+
+assert(arr[0] == 0);
+assert(arr[1] == 0);
+
+arr[0] = 42;
+arr[1] = 24;
+
+assert(load<i32>(HEAP_BASE) == 42);
+assert(load<i32>(HEAP_BASE + 4) == 24);
+
+assert(arr[0] == 42);
+assert(arr[1] == 24);
+
+assert((arr[3] = 9000) == 9000);
+
+assert(load<i32>(HEAP_BASE + 12) == 9000);
+assert(arr[3] == 9000);