[turbofan] support small immediates

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

Index: test/unittests/compiler/instruction-selector-unittest.h
diff --git a/test/unittests/compiler/instruction-selector-unittest.h b/test/unittests/compiler/instruction-selector-unittest.h
index 2be283fd691f940a571e594e4903e68a7e88022a..239968ab20647d7d9359d39eceb17b691312e0d3 100644
--- a/test/unittests/compiler/instruction-selector-unittest.h
+++ b/test/unittests/compiler/instruction-selector-unittest.h
@@ -209,8 +209,12 @@ class InstructionSelectorTest : public TestWithContext,
         EXPECT_FALSE(constants_.end() == i);
       } else {
         EXPECT_EQ(InstructionOperand::IMMEDIATE, operand->kind());
-        i = immediates_.find(ImmediateOperand::cast(operand)->index());
-        EXPECT_EQ(ImmediateOperand::cast(operand)->index(), i->first);
+        auto imm = ImmediateOperand::cast(operand);
+        if (imm->type() == ImmediateOperand::INLINE) {
+          return Constant(imm->inline_value());
+        }
+        i = immediates_.find(imm->indexed_value());
+        EXPECT_EQ(imm->indexed_value(), i->first);
         EXPECT_FALSE(immediates_.end() == i);
       }
       return i->second;