[Interpreter] Add CallRuntime support to the interpreter.

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 6ae888bd31e0ebb852938470d696e616fd34c86d..9e329576809834eefb2a0e3d13befc41f8b71e83 100644
--- a/test/unittests/interpreter/bytecode-array-builder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-builder-unittest.cc
@@ -51,6 +51,7 @@ TEST_F(BytecodeArrayBuilderTest, AllBytecodesGenerated) {
 
   // Call operations.
   builder.Call(reg, reg, 0);
+  builder.CallRuntime(Runtime::kIsArray, reg, 0);

[oth, 2015/09/29 09:33:36]

Curious why this works with arg_count == 0? Runtime_IsArray DCHECKs args_count
== 1.

[rmcilroy, 2015/10/01 17:02:45]

Because the code generated by this test is never actually run so IsArray never
gets called (a bunch of other bytecodes in this tests aren't really runnable
either, it is just a test that the builder does what we expect). Updated to 1
anyway.

 
   // Emit binary operator invocations.
   builder.BinaryOperation(Token::Value::ADD, reg)