tint->dawn: Shuffle source tree in preperation of merging repos

docs/    -> docs/tint/
fuzzers/ -> src/tint/fuzzers/
samples/ -> src/tint/cmd/
src/     -> src/tint/
test/    -> test/tint/

BUG=tint:1418,tint:1433

Change-Id: Id2aa79f989aef3245b80ef4aa37a27ff16cd700b
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/80482
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ryan Harrison <rharrison@chromium.org>

test/tint/array/assign_to_function_var.wgsl

@@ -0,0 +1,52 @@
+type ArrayType = array<vec4<i32>, 4>;
+
+struct S {
+  arr : ArrayType;
+};
+
+var<private> src_private : ArrayType;
+var<workgroup> src_workgroup : ArrayType;
+@group(0) @binding(0) var<uniform> src_uniform : S;
+@group(0) @binding(1) var<storage, read_write> src_storage : S;
+
+fn ret_arr() -> ArrayType {
+  return ArrayType();
+}
+
+fn ret_struct_arr() -> S {
+  return S();
+}
+
+fn foo(src_param : ArrayType) {
+  var src_function : ArrayType;
+
+  var dst : ArrayType;
+
+  // Assign from type constructor.
+  dst = ArrayType(vec4(1), vec4(2), vec4(3), vec4(3));
+
+  // Assign from parameter.
+  dst = src_param;
+
+  // Assign from function call.
+  dst = ret_arr();
+
+  // Assign from constant.
+  let src_let : ArrayType = ArrayType();
+  dst = src_let;
+
+  // Assign from var, various storage classes.
+  dst = src_function;
+  dst = src_private;
+  dst = src_workgroup;
+
+  // Assign from struct.arr, various storage classes.
+  dst = ret_struct_arr().arr;
+  dst = src_uniform.arr;
+  dst = src_storage.arr;
+
+  // Nested assignment.
+  var dst_nested : array<array<array<i32, 2>, 3>, 4>;
+  var src_nested : array<array<array<i32, 2>, 3>, 4>;
+  dst_nested = src_nested;
+}