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.expected.msl

@@ -0,0 +1,53 @@
+#include <metal_stdlib>
+
+using namespace metal;
+struct tint_array_wrapper {
+  /* 0x0000 */ int4 arr[4];
+};
+
+struct S {
+  /* 0x0000 */ tint_array_wrapper arr;
+};
+
+tint_array_wrapper ret_arr() {
+  tint_array_wrapper const tint_symbol = {.arr={}};
+  return tint_symbol;
+}
+
+S ret_struct_arr() {
+  S const tint_symbol_1 = {};
+  return tint_symbol_1;
+}
+
+struct tint_array_wrapper_3 {
+  int arr[2];
+};
+
+struct tint_array_wrapper_2 {
+  tint_array_wrapper_3 arr[3];
+};
+
+struct tint_array_wrapper_1 {
+  tint_array_wrapper_2 arr[4];
+};
+
+void foo(tint_array_wrapper src_param, thread tint_array_wrapper* const tint_symbol_3, threadgroup tint_array_wrapper* const tint_symbol_4, const constant S* const tint_symbol_5, device S* const tint_symbol_6) {
+  tint_array_wrapper src_function = {};
+  tint_array_wrapper dst = {};
+  tint_array_wrapper const tint_symbol_2 = {.arr={int4(1), int4(2), int4(3), int4(3)}};
+  dst = tint_symbol_2;
+  dst = src_param;
+  dst = ret_arr();
+  tint_array_wrapper const src_let = {.arr={}};
+  dst = src_let;
+  dst = src_function;
+  dst = *(tint_symbol_3);
+  dst = *(tint_symbol_4);
+  dst = ret_struct_arr().arr;
+  dst = (*(tint_symbol_5)).arr;
+  dst = (*(tint_symbol_6)).arr;
+  tint_array_wrapper_1 dst_nested = {};
+  tint_array_wrapper_1 src_nested = {};
+  dst_nested = src_nested;
+}
+