avoid thunking trivial values

fix-codegen/src/lib.rs

@@ -116,6 +116,7 @@ pub enum OperandType {
     Const,
     BigInt,
     Local,
+    BuiltinConst,
     Builtins,
     ReplBinding,
     ScopedImportBinding,
@@ -147,6 +148,7 @@ pub enum InlineOperand {
     Const(Const),
     BigInt(i64),
     Local { layer: u8, local: u32 },
+    BuiltinConst(StringId),
     Builtins,
     ReplBinding(StringId),
     ScopedImportBinding(StringId),
@@ -191,8 +193,13 @@ impl<'a, Ctx: BytecodeContext> BytecodeEmitter<'a, Ctx> {
             Arg { layer } => InlineOperand::Local { layer, local: 0 },
             Builtin(id) => {
                 let (_, arity) = BUILTINS[id as usize];
-                InlineOperand::Const(Const::PrimOp { id, arity, dispatch_ip: id.entry_phase().ip() })
-            },
+                InlineOperand::Const(Const::PrimOp {
+                    id,
+                    arity,
+                    dispatch_ip: id.entry_phase().ip(),
+                })
+            }
+            BuiltinConst(id) => InlineOperand::BuiltinConst(id),
             Builtins => InlineOperand::Builtins,
             ReplBinding(id) => InlineOperand::ReplBinding(id),
             ScopedImportBinding(id) => InlineOperand::ScopedImportBinding(id),
@@ -218,6 +225,10 @@ impl<'a, Ctx: BytecodeContext> BytecodeEmitter<'a, Ctx> {
                 self.emit_u8(layer);
                 self.emit_u32(local);
             }
+            BuiltinConst(id) => {
+                self.emit_u8(OperandType::BuiltinConst as u8);
+                self.emit_str_id(id);
+            }
             Builtins => {
                 self.emit_u8(OperandType::Builtins as u8);
             }
@@ -698,6 +709,12 @@ impl<'a, Ctx: BytecodeContext> BytecodeEmitter<'a, Ctx> {
                         self.emit_op(Op::LoadBuiltin);
                         self.emit_u8(id as u8);
                     }
+                    BuiltinConst(id) => self.emit_select(
+                        &Ir::Builtins,
+                        &[Attr::Str(id, TextRange::default())],
+                        None,
+                        TextRange::default(),
+                    ),
                     Builtins => self.emit_op(Op::LoadBuiltins),
                     ReplBinding(name) => {
                         self.emit_op(Op::LoadReplBinding);