[Interpreter] Add support for JS runtime calls.

src/compiler/interpreter-assembler.cc

Index: src/compiler/interpreter-assembler.cc
diff --git a/src/compiler/interpreter-assembler.cc b/src/compiler/interpreter-assembler.cc
index 756f072e1151b92326d94d23ff1bb0aee2ea1292..ed056cfe563cfc24497c865321cd3e0c126ac06e 100644
--- a/src/compiler/interpreter-assembler.cc
+++ b/src/compiler/interpreter-assembler.cc
@@ -226,8 +226,12 @@ Node* InterpreterAssembler::BytecodeOperandIdx(int operand_index) {
 
 
 Node* InterpreterAssembler::BytecodeOperandReg(int operand_index) {
-  DCHECK_EQ(interpreter::OperandType::kReg8,
-            interpreter::Bytecodes::GetOperandType(bytecode_, operand_index));
+#ifdef DEBUG
+  interpreter::OperandType operand_type =
+      interpreter::Bytecodes::GetOperandType(bytecode_, operand_index);
+  DCHECK(operand_type == interpreter::OperandType::kReg8 ||
+         operand_type == interpreter::OperandType::kMaybeReg8);
+#endif
   return BytecodeOperandSignExtended(operand_index);
 }