Eliminate bool vectors in D3D12 compute.

Author: alexreinking

src/CodeGen_D3D12Compute_Dev.cpp

@@ -1058,6 +1058,14 @@ void CodeGen_D3D12Compute_Dev::CodeGen_D3D12Compute_C::visit(const Store *op) {
 }
 
 void CodeGen_D3D12Compute_Dev::CodeGen_D3D12Compute_C::visit(const Select *op) {
+    if (op->type.is_vector()) {
+        // A vector of bool was recursively introduced while
+        // performing codegen. Eliminate it.
+        Expr equiv = eliminate_bool_vectors(op);
+        equiv.accept(this);
+        return;
+    }
+
     ostringstream rhs;
     string true_val = print_expr(op->true_value);
     string false_val = print_expr(op->false_value);