[turbofan] support small immediates

test/unittests/compiler/instruction-selector-unittest.cc

 // Copyright 2014 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 "test/unittests/compiler/instruction-selector-unittest.h"
 
 #include "src/compiler/graph.h"
 #include "src/compiler/schedule.h"
 #include "src/flags.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
@@ skipping 66 matching lines @@
       EXPECT_NE(InstructionOperand::IMMEDIATE, output->kind());
       if (output->IsConstant()) {
         int vreg = ConstantOperand::cast(output)->virtual_register();
         s.constants_.insert(std::make_pair(vreg, sequence.GetConstant(vreg)));
       }
     }
     for (size_t i = 0; i < instr->InputCount(); ++i) {
       InstructionOperand* input = instr->InputAt(i);
       EXPECT_NE(InstructionOperand::CONSTANT, input->kind());
       if (input->IsImmediate()) {
-        int index = ImmediateOperand::cast(input)->index();
-        s.immediates_.insert(
-            std::make_pair(index, sequence.GetImmediate(index)));
+        auto imm = ImmediateOperand::cast(input);
+        if (imm->type() == ImmediateOperand::INDEXED) {
+          int index = imm->indexed_value();
+          s.immediates_.insert(
+              std::make_pair(index, sequence.GetImmediate(imm)));
+        }
       }
     }
     s.instructions_.push_back(instr);
   }
   for (auto i : s.virtual_registers_) {
     int const virtual_register = i.second;
     if (sequence.IsDouble(virtual_register)) {
       EXPECT_FALSE(sequence.IsReference(virtual_register));
       s.doubles_.insert(virtual_register);
     }
@@ skipping 483 matching lines @@
   EXPECT_EQ(s.ToVreg(context2), s.ToVreg(call_instr->InputAt(12)));
   // Continuation.
 
   EXPECT_EQ(kArchRet, s[index++]->arch_opcode());
   EXPECT_EQ(index, s.size());
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8