[test] Clean up a couple TODOs.

R=bmeurer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1698063002

Cr-Commit-Position: refs/heads/master@{#33990}

src/arm64/macro-assembler-arm64.h

@@ -34,7 +34,6 @@ namespace v8 {
 namespace internal {
 
 // Give alias names to registers for calling conventions.
-// TODO(titzer): arm64 is a pain for aliasing; get rid of these macros
 #define kReturnRegister0 x0
 #define kReturnRegister1 x1
 #define kReturnRegister2 x2

src/compiler/instruction.h

@@ -738,7 +738,6 @@ class Instruction final {
     return FlagsConditionField::decode(opcode());
   }
 
-  // TODO(titzer): make call into a flags.
   static Instruction* New(Zone* zone, InstructionCode opcode) {
     return New(zone, opcode, 0, nullptr, 0, nullptr, 0, nullptr);
   }

test/cctest/compiler/test-js-typed-lowering.cc

@@ -163,17 +163,8 @@ class JSTypedLoweringTester : public HandleAndZoneScope {
   }
 
   Node* UseForEffect(Node* node) {
-    // TODO(titzer): use EffectPhi after fixing EffectCount
-    if (OperatorProperties::GetFrameStateInputCount(javascript.ToNumber()) >
-        0) {
-      CHECK_EQ(1, OperatorProperties::GetFrameStateInputCount(
-                      javascript.ToNumber()));
-      return graph.NewNode(javascript.ToNumber(), node, context(),
-                           EmptyFrameState(context()), node, control());
-    } else {
-      return graph.NewNode(javascript.ToNumber(), node, context(), node,
-                           control());
-    }
+    Node* merge = graph.NewNode(common.Merge(1), start());
+    return graph.NewNode(common.EffectPhi(1), node, merge);
   }
 
   void CheckEffectInput(Node* effect, Node* use) {
@@ -558,7 +549,6 @@ TEST(JSToString1) {
 
   {  // ToString(number)
     Node* r = R.ReduceUnop(op, Type::Number());
-    // TODO(titzer): could remove effects
     CHECK_EQ(IrOpcode::kJSToString, r->opcode());
   }
 
@@ -896,9 +886,16 @@ TEST(StrictEqualityForRefEqualTypes) {
     Node* p1 = R.Parameter(types[i]);
     CheckEqualityReduction(&R, true, p0, p1, IrOpcode::kReferenceEqual);
   }
-  // TODO(titzer): Equal(RefEqualTypes)
 }
 
+TEST(StrictEqualityForUnique) {
+  JSTypedLoweringTester R;
+
+  Node* p0 = R.Parameter(Type::Unique());
+  Node* p1 = R.Parameter(Type::Unique());
+  CheckEqualityReduction(&R, true, p0, p1, IrOpcode::kReferenceEqual);
+  CheckEqualityReduction(&R, true, p1, p0, IrOpcode::kReferenceEqual);
+}
 
 TEST(StringEquality) {
   JSTypedLoweringTester R;