Handle pointer types when getting type cast style

Closes #6025

source/slang/slang-ir.cpp

@@ -3970,7 +3970,10 @@ static TypeCastStyle _getTypeStyleId(IRType* type)
     {
         return _getTypeStyleId(matrixType->getElementType());
     }
+    // Try to simplify style if we can, otherwise just handle it unsimplified
     auto style = getTypeStyle(type->getOp());
+    if (style == kIROp_Invalid)
+        style = type->getOp();
     switch (style)
     {
     case kIROp_IntType:

tests/metal/simple-vertex-position.slang

@@ -0,0 +1,16 @@
+//TEST:SIMPLE(filecheck=METAL): -target metal -stage vertex -entry vertexMain
+//TEST:SIMPLE(filecheck=METALLIB): -target metallib -stage vertex -entry vertexMain
+//TEST:SIMPLE(filecheck=WGSL): -target wgsl -stage vertex -entry vertexMain
+//TEST:SIMPLE(filecheck=WGSLSPIRV): -target wgsl-spirv-asm -stage vertex -entry vertexMain
+
+//METAL: position
+//METALLIB: @vertexMain
+
+//WGSL: @builtin(position)
+//WGSLSPIRV: %vertexMain = OpFunction
+
+// Vertex Shader which writes to position
+void vertexMain(out float4 position : SV_Position)
+{
+    position = float4(0.6, 0.1, 0.6, 0.33);
+}