[Interpreter] Bytecodes for exchanging registers.

test/unittests/interpreter/bytecode-array-builder-unittest.cc

Index: test/unittests/interpreter/bytecode-array-builder-unittest.cc
diff --git a/test/unittests/interpreter/bytecode-array-builder-unittest.cc b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
index 144a92d990d0a681c45f0dac76d99f60457e9fe3..be834e419776fd6f067edc396b1b2b0416927032 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -22,12 +22,12 @@ class BytecodeArrayBuilderTest : public TestWithIsolateAndZone {
 TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
   BytecodeArrayBuilder builder(isolate(), zone());
 
-  builder.set_locals_count(2);
+  builder.set_locals_count(200);
   builder.set_context_count(1);
   builder.set_parameter_count(0);
-  CHECK_EQ(builder.locals_count(), 2);
+  CHECK_EQ(builder.locals_count(), 200);
   CHECK_EQ(builder.context_count(), 1);
-  CHECK_EQ(builder.fixed_register_count(), 3);
+  CHECK_EQ(builder.fixed_register_count(), 201);
 
   // Emit constant loads.
   builder.LoadLiteral(Smi::FromInt(0))
@@ -50,6 +50,13 @@ TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
   Register other(1);
   builder.MoveRegister(reg, other);
 
+  // Emit register-register exchanges.
+  Register wide(150);
+  builder.ExchangeRegisters(reg, wide);
+  builder.ExchangeRegisters(wide, reg);
+  Register wider(151);
+  builder.ExchangeRegisters(wide, wider);
+
   // Emit global load / store operations.
   Factory* factory = isolate()->factory();
   Handle<String> name = factory->NewStringFromStaticChars("var_name");