Add 'tricky' OutParams golden output.

This was adapted from a test in SkSLInterpreterOutParams and presents a
challenging double swizzle.

Change-Id: Icb7b3bbb18d4b3cfa0c26acb524c08812ba88096
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/319920
Commit-Queue: John Stiles <johnstiles@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>

gn/sksl_tests.gni

@@ -193,6 +193,7 @@ sksl_shared_tests = [
   "$_tests/sksl/shared/Offset.sksl",
   "$_tests/sksl/shared/Operators.sksl",
   "$_tests/sksl/shared/OutParams.sksl",
+  "$_tests/sksl/shared/OutParamsTricky.sksl",
   "$_tests/sksl/shared/RectangleTexture.sksl",
   "$_tests/sksl/shared/ResizeMatrix.sksl",
   "$_tests/sksl/shared/SampleMask.sksl",

tests/sksl/shared/OutParamsTricky.sksl

@@ -0,0 +1,13 @@
+half2 tricky(half x, half y, inout half2 color, half z) {
+    color.xy = color.yx;
+    return half2(x + y, z);
+}
+
+void func(inout half4 color) {
+    half2 t = tricky(1, 2, color.rb, 5);
+    color.ga = t;
+}
+
+void main() {
+    func(sk_FragColor);
+}

tests/sksl/shared/golden/OutParamsTricky.glsl

@@ -0,0 +1,15 @@
+
+out vec4 sk_FragColor;
+void main() {
+    {
+        vec2 _5_3_color = sk_FragColor.xz;
+        {
+            _5_3_color.xy = _5_3_color.yx;
+        }
+        sk_FragColor.xz = _5_3_color;
+
+
+        sk_FragColor.yw = vec2(3.0, 5.0);
+    }
+
+}

tests/sksl/shared/golden/OutParamsTricky.metal

@@ -0,0 +1,24 @@
+#include <metal_stdlib>
+#include <simd/simd.h>
+using namespace metal;
+struct Inputs {
+};
+struct Outputs {
+    float4 sk_FragColor [[color(0)]];
+};
+fragment Outputs fragmentMain(Inputs _in [[stage_in]], bool _frontFacing [[front_facing]], float4 _fragCoord [[position]]) {
+    Outputs _outputStruct;
+    thread Outputs* _out = &_outputStruct;
+    {
+        float2 _5_3_color = _out->sk_FragColor.xz;
+        {
+            _5_3_color.xy = _5_3_color.yx;
+        }
+        _out->sk_FragColor.xz = _5_3_color;
+
+
+        _out->sk_FragColor.yw = float2(3.0, 5.0);
+    }
+
+    return *_out;
+}