Extra test for push constant pointers

Author: spencer-lunarg

tests/push_constants/push_constant_basic_3.slang

@@ -0,0 +1,30 @@
+RWStructuredBuffer<uint> result;
+
+struct Foo{
+    uint s;
+    uint t;
+};
+
+struct Bar{
+    uint x_unused;
+    uint y;
+};
+
+struct Data{
+   uint a_unused;
+   uint b[4];
+   uint c;
+   uint d_unused[4];
+   Foo* foo_unused;
+   Bar* bar;
+};
+[[vk::push_constant]] Data pc;
+
+[shader("compute")]
+[numthreads(1,1,1)]
+void computeMain(uint3 threadId : SV_DispatchThreadID)
+{
+    result[0] += pc.c;
+    result[0] += pc.b[1];
+    result[0] += pc.bar->y;
+}