Add more dedicated test shader for defer-parens.

reference/shaders/comp/defer-parens.comp

@@ -0,0 +1,21 @@
+#version 310 es
+layout(local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
+
+layout(binding = 0, std430) buffer SSBO
+{
+    vec4 data;
+    int index;
+} _13;
+
+void main()
+{
+    vec4 d = _13.data;
+    _13.data = vec4(d.x, d.yz + vec2(10.0), d.w);
+    _13.data = (d + d) + d;
+    _13.data = (d.yz + vec2(10.0)).xxyy;
+    float t = (d.yz + vec2(10.0)).y;
+    _13.data = vec4(t);
+    t = (d.zw + vec2(10.0))[_13.index];
+    _13.data = vec4(t);
+}
+

shaders/comp/defer-parens.comp

@@ -0,0 +1,30 @@
+#version 310 es
+layout(local_size_x = 1) in;
+
+layout(binding = 0, std430) buffer SSBO
+{
+	vec4 data;
+	int index;
+};
+
+void main()
+{
+	// Tests defer-parens behavior where a binary expression is OpCompositeExtracted chained together
+	// with an OpCompositeConstruct optimization.
+	vec4 d = data;
+	data = vec4(d.x, d.yz + 10.0, d.w);
+
+	// Verify binary ops.
+	data = d + d + d;
+
+	// Verify swizzles.
+	data = (d.yz + 10.0).xxyy;
+
+	// OpCompositeExtract
+	float t = (d.yz + 10.0).y;
+	data = vec4(t);
+
+	// OpVectorExtractDynamic
+	t = (d.zw + 10.0)[index];
+	data = vec4(t);
+}