Implement UnalignedLoad and UnalignedStore in WASM using LoadByte/Shift/Or and StoreByte/Shift/And.

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index 3daef0324ce06b602e62783385b96e23dde591c9..85cf3f3c90c623a1c2e8a18e7bb14ddf6296d0ce 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -530,11 +530,13 @@ struct MachineOperatorGlobalCache {
 static base::LazyInstance<MachineOperatorGlobalCache>::type kCache =
     LAZY_INSTANCE_INITIALIZER;
 
-
-MachineOperatorBuilder::MachineOperatorBuilder(Zone* zone,
-                                               MachineRepresentation word,
-                                               Flags flags)
-    : cache_(kCache.Get()), word_(word), flags_(flags) {
+MachineOperatorBuilder::MachineOperatorBuilder(
+    Zone* zone, MachineRepresentation word, Flags flags,
+    UnalignedAccessConfig unalignedAccessConfig)
+    : cache_(kCache.Get()),
+      word_(word),
+      flags_(flags),
+      unalignedAccessConfig_(unalignedAccessConfig) {
   DCHECK(word == MachineRepresentation::kWord32 ||
          word == MachineRepresentation::kWord64);
 }