[Interpreter]: Add kRegList operand type for register list operands.

test/unittests/interpreter/bytecode-decoder-unittest.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <vector>
 
 #include "src/v8.h"
 
 #include "src/interpreter/bytecode-decoder.h"
 #include "test/unittests/interpreter/bytecode-utils.h"
@@ skipping 19 matching lines @@
        0,
        "LdaSmi.ExtraWide [100000]"},
       {{B(LdaSmi), U8(-1)}, 2, 0, "            LdaSmi [-1]"},
       {{B(Wide), B(LdaSmi), U16(-1000)}, 4, 0, "      LdaSmi.Wide [-1000]"},
       {{B(ExtraWide), B(LdaSmi), U32(-100000)},
        6,
        0,
        "LdaSmi.ExtraWide [-100000]"},
       {{B(Star), R8(5)}, 2, 0, "            Star r5"},
       {{B(Wide), B(Star), R16(136)}, 4, 0, "      Star.Wide r136"},
-      {{B(Wide), B(Call), R16(134), R16(135), U16(2), U16(177)},
+      {{B(Wide), B(Call), R16(134), R16(135), U16(10), U16(177)},
        10,
        0,
-       "Call.Wide r134, r135, #2, [177]"},
+       "Call.Wide r134, r135-r144, [177]"},
+      {{B(ForInPrepare), R8(10), R8(11)},
+       3,
+       0,
+       "         ForInPrepare r10, r11-r13"},

[mythria, 2016/10/03 10:29:34]

May be one more test case with Reg count of 0 for RegList. Something like
CallRuntime with 0 arguments?

[rmcilroy, 2016/10/05 15:48:45]

Good point - done.

       {{B(Ldar),
         static_cast<uint8_t>(Register::FromParameterIndex(2, 3).ToOperand())},
        2,
        3,
        "            Ldar a1"},
       {{B(Wide), B(CreateObjectLiteral), U16(513), U16(1027), U8(165),
         R16(137)},
        9,
        0,
        "CreateObjectLiteral.Wide [513], [1027], #165, r137"},
@@ skipping 24 matching lines @@
                             cases[i].parameter_count);
 
     // Compare.
     CHECK_EQ(actual_ss.str(), expected_ss.str());
   }
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8