[turbofan] Add FixedArray peephole optimizations to CodeStubAssembler

test/unittests/interpreter/interpreter-assembler-unittest.cc

Index: test/unittests/interpreter/interpreter-assembler-unittest.cc
diff --git a/test/unittests/interpreter/interpreter-assembler-unittest.cc b/test/unittests/interpreter/interpreter-assembler-unittest.cc
index 25b306e35924e8bb8d6593698bd791ff5ecb66ce..cd21f095081c97bfc5e0bf97bfdc64016d43358a 100644
--- a/test/unittests/interpreter/interpreter-assembler-unittest.cc
+++ b/test/unittests/interpreter/interpreter-assembler-unittest.cc
@@ -520,9 +520,9 @@ TARGET_TEST_F(InterpreterAssemblerTest, SmiTag) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
     Node* value = m.Int32Constant(44);
-    EXPECT_THAT(
-        m.SmiTag(value),
-        IsWordShl(value, IsIntPtrConstant(kSmiShiftSize + kSmiTagSize)));
+    EXPECT_THAT(m.SmiTag(value),
+                IsIntPtrConstant(static_cast<intptr_t>(44)
+                                 << (kSmiShiftSize + kSmiTagSize)));
     EXPECT_THAT(
         m.SmiUntag(value),
         IsWordSar(value, IsIntPtrConstant(kSmiShiftSize + kSmiTagSize)));