[turbofan] Take the immediate size in account when narrowing ia32/x64 word comparison operators.

test/cctest/compiler/test-run-load-store.cc

Index: test/cctest/compiler/test-run-load-store.cc
diff --git a/test/cctest/compiler/test-run-load-store.cc b/test/cctest/compiler/test-run-load-store.cc
index 6484d30a2b0902cc1f2db65e52e6a240b01c3228..fd25926544a71902c0f7101cecd4041bd3e0be34 100644
--- a/test/cctest/compiler/test-run-load-store.cc
+++ b/test/cctest/compiler/test-run-load-store.cc
@@ -251,6 +251,26 @@ TEST(RunLoadStoreSignExtend32) {
   }
 }
 
+TEST(RunLoadEliminationWithCompareAndTest) {
+  int8_t byte = 0x81;
+  int16_t word = 0xf00f;
+  RawMachineAssemblerTester<int32_t> m;
+  Node* load8 = m.LoadFromPointer(&byte, MachineType::Int8());
+  RawMachineLabel a, b, c, d;
+  m.Branch(m.Word32And(load8, m.Int32Constant(-0x80)), &b, &a);
+  m.Bind(&a);
+  m.Return(m.Int32Constant(0));
+  m.Bind(&b);
+  Node* load16 = m.LoadFromPointer(&word, MachineType::Int16());
+  m.Branch(m.Word32And(load16, m.Int32Constant(-0x7fff)), &d, &c);
+  m.Bind(&c);
+  m.Return(m.Int32Constant(0));
+  m.Bind(&d);
+  m.Return(m.Int32Constant(1));
+
+  CHECK_EQ(1, m.Call());
+}
+
 TEST(RunLoadStoreZeroExtend32) {
   uint32_t buffer[4];
   RawMachineAssemblerTester<uint32_t> m;