[turbofan] support small immediates

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

Index: test/unittests/compiler/instruction-selector-unittest.cc
diff --git a/test/unittests/compiler/instruction-selector-unittest.cc b/test/unittests/compiler/instruction-selector-unittest.cc
index 58946e96d056619e31d5e4bc86ce5a22204bba04..01aa80af7793771d0d0e13f0fd7fa53d0b2c8538 100644
--- a/test/unittests/compiler/instruction-selector-unittest.cc
+++ b/test/unittests/compiler/instruction-selector-unittest.cc
@@ -84,9 +84,12 @@ InstructionSelectorTest::Stream InstructionSelectorTest::StreamBuilder::Build(
       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);