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/expressions/literals/-inf.spvasm.expected.glsl

@@ -0,0 +1,25 @@
+#version 310 es
+precision mediump float;
+
+layout(location = 0) out vec4 out_var_SV_TARGET_1_1;
+vec4 out_var_SV_TARGET = vec4(0.0f, 0.0f, 0.0f, 0.0f);
+void main_1() {
+  out_var_SV_TARGET = vec4(uintBitsToFloat(0xff800000u), uintBitsToFloat(0xff800000u), uintBitsToFloat(0xff800000u), uintBitsToFloat(0xff800000u));
+  return;
+}
+
+struct main_out {
+  vec4 out_var_SV_TARGET_1;
+};
+
+main_out tint_symbol() {
+  main_1();
+  main_out tint_symbol_1 = main_out(out_var_SV_TARGET);
+  return tint_symbol_1;
+}
+
+void main() {
+  main_out inner_result = tint_symbol();
+  out_var_SV_TARGET_1_1 = inner_result.out_var_SV_TARGET_1;
+  return;
+}